A "slutty dan" is a dad/father figure who finds an affair with another woman other than his wife.

See cheater, liar, or slut.
"Where's your husband been all these nights?"
"I kicked him out. He was a slutty dan."
by Mr. Bosley March 5, 2013
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A guy who makes the gayest jokes around other men. Very Socially Akward
Dude Matt was such a Slutty Dan Today.
by Dan Vera December 8, 2014
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