Where two people remove their clothes and rub their bottoms together. Sometimes considered a sexual act, the art of bumming is also considered a ritual in some cultures. Commonly mistaken for anal sex, bumming is actually the craft of gentle contact between the arses.
Gary: "Wanna' have a bummin' sesh?"
Liz: "Yeah! Let's strip down and rub bums!"
Being incredibly lazy and choosing to wear sweats or pajamas for the day.
Girl 1: You look like a mess..
Girl 2: Yeah well I'm just bummin it today
To be sad and negative, bringing down the mood of those around you.
"Why is Jimmy bummin? Oh now I'm bummin... weekend ruined."
Asking for something with no expectation of paying for it.
Bummin is not the same as begging. Begging is often done from desperation while bummin is just asking on an urge.
He be bummin cigarettes from folks.
(Verb) To hang around aimlessly in a state of total relaxation.
Susie: How come John's never out?
Max: He's always just bummin around his house, loser.
In a state of sadness over somethin you can't get over.
Dude, I'm really bummin cause my car just got totaled cause I was stoned.