1 definition by "The Captain"

The act of tucking the testicles into the vagina during coitus. In heterosexual intercourse when the male can somehow insert his balls into the vagina, even if breifly. Advance notice is usually required as this is a pretty difficult move to pull off.
"I was up all night having sex last night, she was such a slut, even did a bit of deaning!"
by "The Captain" August 5, 2012
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