stink up verb2 •(informal) To cause to stink.The broccoli really stank up the refrigerator. •(informal, figurative) To perform very badly in (a place).That's what the Bengals did again Sunday, when, in Wilkinson's words, they "stunk up the joint" in a 31-14 loss to the New York Jets at Cinergy Field. — 1997 formsstunk up · stank up · stinking up · stinks up