Yackbutt 

A specific way of slanting your body when you run to avoid period cramps or pains when long distance running

Sarah: why is Ella running like a Yackbutt???
Hazel: Oh, she has a cramp from girls on the run!
Sarah: Ohhh, allright.

Yackbutt by soyfishcaca December 29, 2020

yuckbutt 

Wet substance remaining in the anus. Can be caused by lubricants, semen and even crap from a poopdick.

Roy had a yuckbutt after a pleasent evening with Troy.

yuckbutt by Justin W September 28, 2005