turning the 6-4-3
Turning the 6-4-3 is a "Double Play" in baseball, but used in American slang as the term for a Threesome.
Tee: Dude, him and his wife wouldn't quit hitting on me all night!
Huck: That's cause he was goin for turning the 6-4-3!
Huck: That's cause he was goin for turning the 6-4-3!