Searching for a fat girl's vagina to initiate intercouse while layers and layers of blubbery lard get in your way. Thus making a diving maneuver completely necessary.
Guy 1: "Yeah, dude, I totally fucked ____ last night."
Guy 2: "Isn't she like 200 pounds though?"
Guy 1: "Yeah. I was totally muff-diving but it was worth it."
by Cam_bush13 June 18, 2017
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a person who all he (or she) likes to do is give oral sex to a women

or it could also be used as an insult to a douchbag
1.ahhhh dude muff dive mcgee, how was she.

2.hey muff dive mcgee......fuck you
by tee hee bitches October 2, 2007
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When two female Olympic divers 69.
“Did you watch the Games last night? You just know the Canadian women’s team did some synchronized muff diving in their hotel later.”
by LinzerTorte July 28, 2021
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When you shove your head up a vagina in an extreme sport way
"Man, that girl is a cave. Everyone goes extreme muff diving in her"
by Fuckmonkey99 February 20, 2018
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The act of performing oral sex on a female while plastic straws are inserted into the nostrils of the 'performer' to allow for optimal breathing. This reduces the risk of the individual losing consciousness during the act.
"Hey guy, why you gotta nosebleed?"
"Me and the misses were in the middle of a martian muff dive and the straw got jammed in one of her rolls."
by bobbin frapples October 15, 2009
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Deep Sea Muff Diving: Water is wet and deep, so is your bitch's pussy. When you go muff diving on your woman's pussy, her cum is vast just like the ocean sea.
"Get yo towel bitch, cuz I'm goin deep sea muff diving' in yo great sea of pink."

"Im'a git my snorkel before I be deep sea muff divin' in that pink pussy !"
by J-Lez September 23, 2021
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