bummy /ˈbʌmi/adjective 2noun 1forms 3 adjective2 •(US, informal) Like a bum (homeless person or hobo)The fact is, they are not nearly as bummy as a lot of the characters we have back home. — 2005 •(slang) Lousy; depressed or disappointed.Mike is bummy that Ian's news is so Grummy. I say heck with it all and I'm getty Rummy. — 2009 noun1 •(slang) bottom; buttocks"...Do you mean to tell me they have every man strip and bend over to show his bummy?" "Actually, Malcolm, they do. Physicals, very complete physicals I should add, are required." — 2001 formsbummies · bummier · bummiest