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1.
Much like the act of Tbagging. A Tgag is inserting the scrotum sack in to a sleeping persons mouth and actually making them gag on them.
Brennon was so wasted he passed out with his mouth open and Eric Tgagged him over and over
by Rev. Budders October 28, 2010
 
2.
A synonym for T Bag, or a nickname of sorts.
T Bag: i dont like the name "T Bag"
Me: Fine. I'll call you T Gag until you get used to it, then change back(just to piss you off, that's why.)
by B.I.GBombers May 12, 2007