Top Definition
The act of performing fellacio to the point of gagging, not once, not twice, but repeatedly. The gagging won't stop you from sucking his cock.
"My girl was on a gag-a-thon last night!"

"Dude, right on!"
"Word. I kept thinking she'd stop but that gagging didn't stop her from going down."
"Awwwww shit."
by DonkeyDo January 26, 2011
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