gits and shiggles
If you have teachers who don't care for swearing, it is a more school appropriate version of shits and giggles.
Blake-"Why are you hiding Clark's pop from him, he is going to be pissed!"
Jason-"Just for Gits and Shiggles."
Jason-"Just for Gits and Shiggles."
Gits and Shiggles
Doing something for fun, or for no particular reason.
"I just ate a Carolina Reaper."
"Why?"
"I dunno, gits and shiggles."
"Why?"
"I dunno, gits and shiggles."