Noogies really hurt, but they aren't as bad as wedgies.
To grab someone around the neck with your arm, pull their head against your body (thus subduing them), make your other hand into a fist, and grate your knuckles painfully against their scalp. If you're sneaky enough, grabbing them around the neck may not be necessary.
A favorite tactic among bullies and older siblings.
Hey! Don't give me a noogy! It breaks my hair! - My sister
The idea that a noogy is rubbing someone on the head is incorrect that is a dutch rub. Anyone who has ever watched Classic Saturday night live knows that a noogy is given by making a fist and extending the knuckle of the middle finger so it sticks out a bit then rapping someone on top of the head with it. This from the classic bits where Bill Murray and Gilda Radner played nerdy schoolkids.
Dude1: What's the matter?
Dude2: that ass Bobby just got a running jump and gave me a flying atomic noogy. I think I might have a concussion.
when someone scratches another being on the head and usually messes up their hair.
Paul gave Caroline a noogy she was very mad, but laughed in spite
Another term used for a rim-job.
Ew... why would someone want to give a noogy? That would taste like poop.