A game your uncle plays with you as a child when you sit on his lap and a mysterious finger enters your butthole but his hands are over your eyes.
"Dude I played Uncle Finger last night and something was totally there, it was so trippy."
While you're on top of the female, your uncle comes and puts his penis in the females mouth with his butt facing the other guy. The other guy then shoots his semen onto the uncle's butt-hole and lets the nut drip onto the face of the female.
Last night, I was doing a Criss Cross Uncle Sauce with Kevin and his uncle.
What my nephew/nephews/niece/nieces is/are gonna call me because my name is Benjamin.
I, Benjamin, am going to have a nephew/niece, probably more. I'm going to be called Uncle Ben
To Tighten something like uncle garth
Person 1: "Whos tightened that up? "
Person 2: "Garth's uncle!"
Or
When tigheting something:
Person "Garth it!"
A lazy person (slacker), who is laid back by nature, and unreliable in general.
Would you hire Bob to clean your gutters for you? Probably not, he can be a bit of a Cat's Uncle sometimes.
Dude my mom's new boyfriend is a real Cat's Uncle, I mean he doesn't do anything!
Too put a finger in someone’s bum.
He tried to to uncle Mike me!