To love something entirely. To love something as though it where a falic object and you were to take it so far down you would gag. Can be used with sarcastic undertones actually meaning that you totally despise something or someone.
SCENARIO 1
Person 1: Wow, Bay St Pizza is SO good.
Person 2: yeah, you gag-for-it

SCENARIO 2
Person 1: Dude....this movie sucks
Person 2: Cmon man, you gag-for-it

SCENARIO 3
Person 1: Oh man, I gag-for Jessica Alba
Person 2: I gag-for hot girls regardless
by Simon a.k.a Wogdog March 12, 2006
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Military drill sargents, while they are screaming at new recruits, sometimes, when a recruit is slow to respond use the phrase "I AM Gagging for it" soldier

Law School Teachers may also the lingerng version when waiting for a student to answer or comment.......gagging....or gagging for it.....to indicate they cant wait for the students reply
Drill Sergant- Privite Dillweed, I AM GAGGING FOR IT!!!!!!!

Doctor Legal Instructor dude- Please Mr Soanso- I am gagging for it

a few mins later - nods - gagging
by vineset55 January 04, 2010
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an gag is when you want to gag with disgust, but you're paralyzed with pure hatred and fear for whatever it is
Murray's music makes me want an gag!
by Chuzzington February 03, 2010
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It means to vomit. It is the same thing as saying: to barf, to puke, to make street pizza, to say hello to the porcelain god and so on and so forth,
Geeez, that dude is shitting on the yard; it really makes me wanna gag.
by William Orellana April 19, 2006
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To gag is to fail at a task attempted.
I tried to send those pictures via email, but my computer gagged on them. I'll try again
by Jim Inman August 19, 2006
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