Top Definition
when walking down the street and a random person violently thrusts their bum into you and then continues on their walk as if nothing ever happened. This ends up inferiorating the victim and continues the bum cycle.
{girl walking down hallway}

{guy eying her hungrily}

{guy thrusts bum into girl and then sandwiches her into the locker jostling her a little bit}

{guy walks away as if nothing has happened}

The girl has just been victimized by the violent bum bum. and she continues to victimize others with this vicious cycle known as the bum bum war.
by Chelsea Smith/Kristin Glancy August 14, 2008

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