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Butt-up syndrome 

When a person is sick and when they go to use the bathroom to take a dump, a sudden urge of vomiting arise and with no to wipe, flush, and pull your pants up, they get on their knees and vomit with their naked butt up in the air.
My mom caught me in the bathroom with butt-up syndrome. She asked me "Saba why do you have your pants down when you are vomiting" I replied, "Because I didn't have time to wipe and pull them up!"

butt up front 

Phenomena which occurs when a very fat person shoves the lower part of their stomach beneath the waist of their pants creating the appearance of an extra pair of buttocks.
Man, after Jenny had her baby she developed some major butt up front.
butt up front by FergusonTO35 October 21, 2010

Butt up their ass 

When you are particularly stoned as fuck and you try to say "stick up your ass" but instead say "butt up your ass".
Izzy
Izzy: "Why do British people talk like, that like they have a butt up their ass. Oh wait, I mean stick up their ass... hehehe"

Back that butt up 

Butt'r Up 

A frozen stick of butter that is inserted anally. Can be used as a oily enema, a fast and loose lube suppository, and a cold booty delight. This bathroom pre-game can be used in many anal applications.
"Jeremy my good man, perhaps we shouldn't have indulged ourselves so in the Arby 2-for- $5 deal!
"Fret not Wattsworth, I purchased just the thing! Butt'r Up was on sale in the dairy aisle. Pucker up."
Butt'r Up by Brotha Brad September 18, 2025

stick up their butt 

Someone who is particularistic, ridged, and not flexible. Not fun, cannot see humor, and overall, unpleasant.
They complained about that? They must have a stick up their butt.
stick up their butt by Family Sherpa February 26, 2014