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2.
it is the act of being t-bagged by a dog
did you see that great dane
yeah he he dog bagged me

holy shit dude that was a total dog -bag
by widespread March 18, 2009
 
1.
A member of the opposite sex that try's to penetrate a friendship by sleeping with 2 best friends.
Johnny sleeps with Sarah, but then immediately tells Jenny(her best friend) he loves her and wants to be with her instead. True Dog Bag material.
by Tonsta January 03, 2012