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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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2
Getting high on bashed up cocaine in a shitty town pub because there’s nothing better to do with your waster friends.
β€œYou on the bag tonight Steff?”

β€œNo, Llifon Three Bags will be out later, I’ll scav some off him”
by iwtom May 13, 2019
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