A british term for borrowing a cigarette off someone. Bumming being another word for borrowing and fag being common slang for a cigarette.
American meaning to have anal intercourse with a homosexual man. Bumming to mean the intercourse and fag to be a derogatory name for a homosexual male.
"Hey Dave, Paul's been bumming a fag off me all week. Its about time be bought his own cigarettes and stop asking me for them."

"Did you hear that James was gay? He came out last week"
"Yeah but everyone knows hes been bumming that fag downtown for almost a year now."
by Emdawg September 28, 2013
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to borrow a cigarette from an english chap.
X:Can i bum a fag mate?
Y:I'm not your mate Fag!
X:No no no, a Fag is a cigarette.
Y:YOU'RE A CIGARETTE!
by cheese July 25, 2004
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1. To borrow a cigarette from an english chap

2. To stick a dick in a gay guys ass
1. Excuse me my good chap, may I perhaps bum a fag.

2. I once accidentally clicked on a gay porn site on al4a.com/links.html and saw some guy bumming a fag.
by bt February 28, 2003
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British:Can i have a cigarette

American:Can i have sex with a homosexual
British:
Person 1 can i bum a fag
person 2 sure "hands cigarette"

American:
Person 1:Can i bum a fag

person2 sure but im not gay
by hjdhgjf March 22, 2020
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Bumming A Fag, is a term in the 1960's people used to use if they were a bum and/or just asking for a smoke.
-Hey jerry, watch out, there's a guy at the corner "Bumming Fag's" off people.

Hey buddy can I "Bum a Fag"?
by PHV Overlord July 17, 2006
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Normally encountered when twos'ing or saves on a fag. One moronic person will put the fag too far into his/her mouth or get the butt wet with saliva.
TO BUM A FAG
1: i thought we said twos!
2: Yeah sorry!
*2 passes fag to 1 who puts it to their lips*
!: You twat, you fucking bummed it!

by YTRIJORTIJYOR August 08, 2008
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