(UK, US, informal) Like a bum (homeless person or hobo)
An unsuccessful dude would dress all bummy and stuff. A successful person would dress like perfect; they'd not dress bummy at all... 2010, David J. Harding, Living the Drama, page 57:
The fact is, they are not nearly as bummy as a lot of the characters we have back home. 2005, Boye Lafayette De Mente, Romantic Hawaii: Sun, Sand, Surf and Sex, page 46:
"...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, Lawrence A. Wenzel, The Sandcastle at High Tide, page 174:
“Feel me up and rub your pussy against mine, that'll make the pain in my bummy go away, it will,” she told me. I felt sorry for her. And I guess that's why I let her show me how girls made out without boys. 2009, Arlene Gorey, My Spanking Diary:
From bummer (“a disappointment, a pity, a shame”) or bummed out, + -y.
Meanings
(slang) Lousy; depressed or disappointed.
(see title) 2000 December 10, Megan, “Bum bummy bummers!”, in uk.people.support.depression (Usenet):
Mike is bummy that Ian's news is so Grummy. I say heck with it all and I'm getty Rummy. 2009 February 14, msmomo2u, “ott; A New Word is Born”, in alt.support.stop-smoking (Usenet):
(see title) 1999 December 20, john lowe, “i feel bummy”, in alt.fan.hello-kitty (Usenet):