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Someone who disturbs sleeping or intoxicated homeless people by knocking them over. Similar to cattle tipping. May also be used as a derogatory term.
That Andrew is a dirty bum tumbler.
by SomeGuy1981 June 28, 2011
gaylord or another way of saying bumblefaggot
why are u such a bumtumbler or stop being a bumtumbler u bumblefaggot
by MR.knowlegedable July 24, 2011