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1.
A sexual, and extremely disturbing sexual act, in which you fist a girl in her vagina so hard, that her intestines play peekaboo throughout her asshole.

See fisting.
"I gave that bitch a danish handshake before she dumped me. LOLz0rzroflmaomg!11!"
by Mitch Teh 1337 May 05, 2009
 
2.
The pursuit of mutual mirth enjoyed by a party of two hetrosexual males, one of whom vigorously stimulates the other participant's reproductive organ.

Climax is defined by a shared hilarity as opposed to the usual shameful orgasmic finale.
"Yeah, the pitch went fine, after some initial friction, I sealed the deal with a Danish handshake, Lol."
by swedishNigel April 14, 2010