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the male version of "on the rag" used to describe a dude who is in a foul, pissy or otherwise bitchy mood for no apparent reason.
Dude #1 - What's up with John? He's acting like such a frickin tool for no good reason.

Dude # 2 - I don't know what his deal is!

Dude # 1 - He must be "on the bag" the little fag!
by rinker November 04, 2009
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