1. something that bums you out or annoys you
2. dressing like a hobo or bum (for either gender it usually refers to wearing just sweats and a tshirt and for girls it also means no makeup and wearing your hair in a messy ponytail)
"Dude, it's bummish that you can't go to the party on Friday."
"I'm going to be looking bummish today because I was too lazy to find nicer clothes."
Noun - Bummish is the universal language spoken and understood only by the homeless. While the origins are unknown, Bummish is believed to have been influenced from Classical Greek and Latin and evolved due to elisions of the ablative forms of both these languages.
The man over there is speaking a similar language to Bummish, he is probably homeless.
Nick and Perry have studied Bummish so long they are able to freely converse with homeless people and not get attacked.
Watchin a TV show such as lost online
Jessica is totally bummish