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Two people who are inseparable, they are always seen together.
Dan and Joe are such BumChum's they are always together!!
by Nat-Man April 12, 2007
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A slang term for a man or teenage boy who is gay i.e. likes making love via the rectum, either:-
- likes putting his cock in his partner's butt
- likes his partner putting their cock in his butt
Rachel: 'Wow, Jason is so cute, I'd love to be his girlfriend'
Emma: 'Sorry Rachel, he's a bum chum, he wouldn't be interested'.
Rachel: 'Damn it'.
by Online Fan December 12, 2016
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when someone is over friendly to someone and doesnt leave them the fuck alone ever and is constantly around them and being nice to them despite how they're treated by them
fletcher proceeds to follow bradley around 24/7

fletcher "hey bradley what shall i buy you"
Bradley "Everything"
Fletcher Gosbee "Ok bradley!"
Bradley 'Takes things'
'From a distance Mac says'
Mac: "Fletcher bumchums bradley so much"
Fletcher: Follows him around 24/7 and doesnt leave him alone (Basically wants anal)
by danyall November 14, 2017
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An overly friendly humanoid of the masculine variety with a preference for other males. They like to spend their time investigating cracks and crevices. Favourite games include Hide the Sausage and Where's the Salami. Often answers to the name Jimmy, James, Jimbo or Jimbob.
Chrissy: BumChumSayWhat?
Jimbob: WhhhaaaAAaaaAAaaatttt????
by ChrissleWissle September 01, 2004
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(putative) homosexual anal sex partner (mildly derogatory)
Look, there goes John with his bumchum.
by lord british October 19, 2003
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Australian Slang

best friends, mates, chummy, friends you feel totally comfortable with
John and I are bum chums!
by J-Boi September 14, 2006
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