A collection of the most plausible scenarios of Equestria Girls wetting themselves.
Contains: Wetting, obviously. The second version of the Rainbow Dash chapter contains scat as well, but if that's a turn-off to you, you can just read the first version. It also contains a few farts, and so does part of the Pinkie chapter (but not from Pinkie, aside from brief mention of farting contests with Rainbow Dash, as I have no doubt they actually do). If you don't want the Equestria Girls to wet themselves, ignore this story. It's not even official canon so it doesn't have to be if you don't want.
I already did one for Princess Twilight, and an aftermath one for Rainbow Dash. So I'll do one for the other Equestria Girls, except EqG Twilight, who I can't really think of one for yet. (Hence the Incomplete tag)
While these are the most likely scenarios that could lead to a wetting with them, I know the closest they've come to directly implying a wetting (other than a messy diaper scene with foals) is Fleur being desperate at the back of the bathroom line, and while it is likely she will wet her shorts, we don't know that for sure, she still could have made it. But behind the scenes, outside the restrictions of a kid-friendly show, any of these could potentially happen and I tried to make these as un-stretchy as possible even though canonically all of them probably never wet themselves, even Rainbow Dash. (But there was an official book, though one whose canonocity can be disputed, which had pony Rainbow Dash say "I almost wet myself. But I didn't." Not to mention Pinkie's desperation in an actual episode, though she made it too)
Contains some Flutterdash and Rarijack since those seem to be the canon ships of EqG.
Twilight chapter is now up, but I put it before Pinkie's chapter, as it's mostly set during Legend of Everfree, which I set Pinkie after. Twilight chapter might be stretchier than the others but it was the best I could think of.