A person who, when chores obviously have to be done, contributes nothing and sits on his or her ass. Most apt when the person is among others who are pitching in to help.
(wîrd)(ás)(pärté)
n. pl. weird ass par·ties
def: A social gathering for pleasure or amusement, focusing on or celebrating the strange or otherwise out of the ordinary; rectum, behind, bum, rump, gluteus maximus, dumper or posterior.