Top Definition
to greengum

to know everyone on a forum and appear around Halloween with an odd name pretending to be a new member just to spook them. Only works if no-one else is in on it, and all 'slips' are intentionally confusing to throw them off the scent. They must never find out or you will be bluebummed
I getcha... bluebum the greengum!
by spilkmilt November 01, 2010

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