I'm trying to find a story where it starts with twilight and rainbow in a locker room in the equestria girls universe and I had a chapter with fluttershy and big mac. I forgot the name of it. I remember those parts but it was. Awhile ago since I read it. Id appreciate some help finding it. Also hello I'm new here lol

There are very few TwiDash stories within the EqG universe. I can only think of 3 off-hand. This is the only one that involves a locker room and mentions FlutterMac. https://www.fimfiction.net/story/176475/the-big-cleanup

Edit: Unless you mean this ... https://www.fimfiction.net/story/27218/ponyville-university

5773400 pony university is what it was! Thank you very much!