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1.
Performing fellatio or having it performed by relaxing the back of the throat, eliminating the gag reflex, to allow deeper penetration of the penis.
My girlfriend enjoys the power she feels in making me climax by deep throating.
by The Doctor September 28, 2004
 
2.
Sticking one's dick, if long enough, deep down a girls throat. If gag reflex is present forcing the girl to gag.
Fuck dude i made her deep throat my cock.(verb)
She deep throated my cock. (verb)
by Heroguy June 09, 2004
 
3.
Sticking one's dick down a girl or guy's throat, them the one who is sucking eating the cum that comes out.
"Did you hear about that girl who gave that guy a blow job?"

"Yeah, she was deep throating, she swallowed all that cum that came out."
by Yomama May 08, 2004