assbuttress 

To hold or support a heavy ass.

Jose is such an assbuttress.

assbuttress by Phillie Blunt 2 dope represent May 5, 2019

ass buttress

Person who serves only as support structure for their ass. Similar to asshat.

Did that asshole just brag about riding a bike with only one gear? What an ass buttress!

ass buttress by shmuckatelli December 15, 2017