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2.
A derivation of the 'blowjob' a slag term for the act of fellatio. The primary difference being that the objective of a 'blowjob' is to blow one's load, whereas the objective of a 'gagjob' is to use one's erection to gag the provider of oral stimulation.

The gagjob rose in popularity through 1990s but was not formally recognized until after Sept 11, 2001. When through frustrations over our inability to capture the elusive Osama Bin Laden, we turned to choking women with our cocks.

The gagjob has risen to the level of 'preferred filth' for many porn enthusiasts leading to the creation of websites such as; gagsgirls.com, makethemgag.com, the gagging blog, and deepthroat links to name a few.
Examples:

That girlscout got such an intense gagjob that she puked.

The skank's eyeliner was running after the gagjob; either from tears, sweat, or shame.

Caution: a gagjob might cause brain damage.

www.facialabuse.com

www.deepthroat-blowjob.com

www.ideepthroat.com

Turkish Waterfountain

Face Rape

Heather Graham

Chili Abuse
by 9millbill January 05, 2010
 
1.
A variation on the blow job in which the man has intercourse with a woman's (or a man's) mouth, grabbing her head and forcing his penis so deep into the receiver's mouth that it goes down the throat, resulting in gagging, choking, and hopefully vomiting on his genitalia. Also, the gagger can voluntarily choke herself on the penis, by thrusting her head back and forth as she attempts to swallow it.
Dude, I'd like nothing more than to make that girl give me a gag job -- just fuck the shit out of her mouth till she barfs all over my cock.
by fripp December 07, 2006
 
3.
Someone who you fuck although every word out of their mouth is garbage. The metaphor is stuffing a gag in their mouth so you don't have to listen to their nonsense while you bang them. You could be fucking them because you're desperate. You might screw them because, despite being stupid, arrogant or full of themselves, they are extremely physically attractive or sexually skilful. Compare and contrast with 'bag job'.
Tony's a moron, but a great gag job. He ate my pussy and hammered my g-spot all night, but as soon as he opened his mouth I threw him out.
by Mr Whoohoo December 27, 2006