Top definition
when a couch potatoes ass has grown so big that it has started to conform to the shape of the couch.
#1 OMG....look at that ass!!!! It is HUGE!!

#2 Yeah, look at that couch butt.

#1 looks like the cushions just suctioned themselves to her backside.
by ZipItGood March 15, 2011
Happy St. Patties Day!