Top Definition
When a woman is about to poo and a man sticks his hand up her butt and grabs a clump of poo out. Then he proceeds to smack it across her face, which looks like the snorkel mask. Then he takes his penis and rubs it around her mouth, giving the snorkel mask effect.
Last night we were feeling adventurous, so my girlfriend and I went anal diving through the Great Barrier Reef.
by liz and heather May 23, 2008

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