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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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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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Two males that enjoy giving each other anal pleasure, through the insertion of the penis into the tight orifice (or sometimes loose) of the anal cavity.
"Well young sir, i heard Trizzo and Ratboy are quite the bum chums"
by DogRip January 19, 2007
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