There were three things about Rainbow Dash. She was tomboyish. She was athletic. And she smelled bad.

Although she was friends with a ladylike girl named Rarity, Rainbow Dash only washed once or twice a week, and she didn't use soap. Her boyfriend, Cherry Fizzy, liked her this way. She did, however, wash her hair, so it wouldn't be so itchy. Besides, Cherry liked her hair better when it wasn't greasy.

It was now the first Friday after the Sunday in which Rarity had set Rainbow Dash on her first date. As it was mid June, the weather was still very hot, so Rainbow Dash sweated twice as much during her athletic activities. Having not washed since her bath on Sunday, Rainbow smelled bad again. Rarity had to sniff her up close to notice, due to wearing perfume, which is why she hadn't noticed a smell before Sunday in all the years she'd known Rainbow Dash. That being said, Rarity would still hang out with her even though she knew now how grungy she was. But she always kept some air freshener handy just in case.

Rainbow wore her same white shirt, blue vest, pink and white mini skirt, and black compression shorts every day, even to bed. She pulled her shorts down only to go to the bathroom, and to shower. She only washed her outfit while wearing it in the shower after getting covered in mud, or dirtier than usual in any other way. After which, she'd blow dry her outfit with hot air after blow drying her hair with cool air.

Rainbow Dash was playing soccer outside for gym class, which was the first class of the day. As usual, she was the best at the sport, and had a lot of fun playing it. Halfway through the game, when they took a break, Rainbow Dash walked a bit to the side of the field and let out a few loud farts. She looked over at Cherry and winked. She also caught sight of the class clown, Pinkie Pie, giggling.

...

The second class was English. Rainbow Dash sat in her desk, her hair and outfit soaked with sweat. As the teacher read the next chapter of their novel, Rainbow Dash felt another fart coming.

Usually she'd hold it in class. But, she could have sworn Pinkie Pie was laughing at her farts. She wanted to make sure. If she did, they could have a lot of fun together.

Rainbow lifted her leg slightly.

PPPPPPPPFFFFFFFFFFFFRRRRRRRRRRRT!

A boisterous wet fart erupted out of the smelly girl's rear. She chuckled a bit, and looked around for a reaction. All her classmates, including Rarity, looked unamused and annoyed. All but one.

Pinkie Pie was throwing a fit of laughter, tears streaming down her face as she banged her fist against the desk. Rainbow was now convinced - Pinkie did find it funny when she farted.

"Rainbow Dash, Pinkie Pie, can you please not interrupt?" said the teacher.

"Sorry about that," said Rainbow Dash. "I just couldn't hold it."

Pinkie stopped laughing. Rainbow could have sworn she was blushing lightly. "Neither could I. My bad!"

The teacher resumed reading.

...

At recess, Rainbow followed Pinkie out of the classroom.

"Hi Pinkie," said Rainbow Dash. "I don't think we've got to know each other all school year. I didn't know you thought farts were funny."

"Are you kidding?" Pinkie turned around. "They're the funniest thing in the whole wide world!"

Rainbow noticed Pinkie's jean shorts were wet. "Um... did you..."

"Yeah, I do that a lot when I laugh really hard. Especially at farts." Pinkie blushed a little. "I hope you don't mind."

"Not if you don't mind me smelling really bad."

Pinkie sniffed Rainbow. "Phew, you do smell bad, Dashie!"

"And I'm proud of it. My boyfriend likes it too."

"Hey, Rainbow Dash!" Pinkie lifted her leg and let out a long, high-pitched, wet fart. She giggled a bit.

Rainbow fell on the floor laughing at the sight of the pretty pink girl farting in wet shorts.

"It's so exciting to find someone who finds it as funny as I do!" Pinkie grabbed a box of fart powder from her locker, ate a bit of it, and farted repeatedly within seconds. Each fart loud and explosive.

Rainbow laughed so hard she wet her shorts.