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1.
A teen drinking game in which one chugs a bag of Franzia wine while several others circle around the drinker, taking turns slapping or hitting the bag of wine.
"Adam got me to play hit the bag last night and it was complete hell"
by OvenFreshPastry July 23, 2008
 
2.
another term for masturbation. especially male masturbation.
the guy hit the bag in the hallway at school
by someone May 13, 2004