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A phrase used by the porn(adult entertainment) industry to describe the male penis fully entering the woman's vagina or anus during sexual intercourse. Very interesting to watch over and over again ;^B.
Damn! That bitch got some serious deep penetration by black dick!
by urban pervert February 8, 2003
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A procedure performed by tongues of dimensions 5 inches or longer where the G-spot is stimulated until the point of orgasm

It can also be a term used for food.
"I just finished performing deep tongue penetration on my icecream and now my tongue is numb ," squealed Lucy.
by Lester the molester6969 March 29, 2018
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