The act of mightily punching a man's balls after he has said something you (a) don't agree with or (b) find offensive. Generally it is done with a fist, but numerous other things are acceptable (i.e. foot,
knee,
snowball, etc.) Generally only done to people you have known for a
reasonable length of time.
Logan: Sara would totally hit that!
Sara: Would not! That brings your
total up to 18.
Alex: What total?
Sara: Well, I've only known him for a month or two, so I can't scrotch him yet. But when I know him well enough, he's
getting it.
Alex:
That's what she said.
(A scrotch ensued shortly after this.)