When you have like 100 guys run train on a girl and the last dude has to eat her out.
"Man, I was the last dude on a slurpy swamp the other night."

"Right on dude."
by Slurpman June 8, 2020
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A type of oral sex in which a person licks the vagina of a person who has not cleaned it in several days. The vagina has to be secreting some type of discharge or liquid on top of already being aroused.
My girlfriend is preparing for a slurpy swamp this Friday.
by hxxule October 18, 2019
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When a girl gives you head, and then you proceed to give her anal
That bitch thought she was giving me head. Then, I told her to turn around, and I gave her that slurpy swamp
by Cash and Bailey December 24, 2019
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