1. Being bumming out

2. Scrounging for something.

1. When followed with 'around', used to mean procrastinating, or acting lazy and not doing anything.

2. To engage in anal intercourse.

3. To get something by begging, or mooching.

Anal sex. When a man inserts his cock into another mans ass and fucks him until he shoots his load up the mans ass.

borrowing something from someone else

n. Brit. working class slang for anal gay sex, becoming archaic since 80s with more informed society. Usually used with amusement, not prejudice, typically by people naturally tolerant but less informed about gay life. (Middle classes and prejudicial people would typically avoid slang, sometimes to avoid being seen as <italic>not</italic> prejudiced by a homophobic listener to gain approval.

Sitting on your ass, procrastinating.

Taking it up the dirtbox for sexual kicks, usually with a group of masturbating masked men looking on and stroking their meat!

Term given to the act of anally ramming someone. This can be physical (anal sex/gay rape) or merely psychological (in that the ramming is performed via words, social networking etc)
The latter tends to aggravate spectators more as it is a wholly warped and embarrassing way of attempting to make friends or stimulate a relationship with someone of the opposite sex.
One of the most hilarious technique of bumming is unanimously the 'facebook bum'. This occurs between two people over the social networking site, and can involve anything from a poke war to a full scale conversation on eachothers walls, ending in variations of 'loveee yaaa!! xxx'
Other ways of bumming include mysteriously laughing at someones abysmal joke, or exerting extreme physical contact onto those who you wish to bum (this may sometimes occur when drunk, in which case it is not bumming)
WARNING - attempting bumming can result in serious loss in respect.