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1.
A Cunnilignuis (pussy licking) technique.

Going Down Under, level III Blue Rank

A "Muff (vagina'pussy)" Diving specialty, only performed by high level muff divers. Requires massive Lube, the pussy snorkel, and hard malt liquor"
"WHOA...did you see that? He pulled off a Tri Tran 2 minutes in and ended with a double chin crease the to muff!"
by chen deng zhi December 17, 2004