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A recreational hobby common among rural students attending college in the city. It is viewed as an acceptable alternative to cow tipping when no cows are available. Under cover of darkness, students sneak up on an intoxicated bum and upend either the bum, the bum's shopping cart, or both.

"Dude we went bum tipping last night; it was just like tipping cows back home, only with more noise!"
by Ladderwalker February 03, 2009
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The act of pushing a bum off a subway seat or platform bench
When drunk and bored on the subway, bumtipping will kill some time.
by traxy July 30, 2010
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