The phrase "drunk uncle" refers to a family member, usually an uncle, who often drinks too much alcohol and behaves in a silly or embarrassing manner when he is intoxicated. Full definition
Music is kept to a minimum, unlike at weddings, bar / bat mitzvahs, Sweet 16s, quinceaneras and other family events, where the guest list inevitably includes that drunk uncle who bellows, «You're all grown up!» (wendybrandes.com)
Try not to listen to crazy drunk Uncle Sal talk about his «business» too much for fear of a federal RICO subpoena. (religion.blogs.cnn.com)
Arsenal is now like a big family, and like every family expect it to have a crazy cousin Larry, always drunk uncle Charlie, slatty cousin Mary, always moaning Grandad, etc.. (justarsenal.com)