Pimp slaping someone... The "up side" of your hand or back-hand is used instead of the palm. Commonly used when pimping women and they get out of line.
Pimp: Baby u owe me $500.

Pro: uhuh papa it is only $300...

Pimp: Dont make me upside your head!
by FistyCuffs October 2, 2006
Get the upside your head mug.
What you say to someone who is either lying to you, bullshitting you, or doesn't know what they're talking about.

Another way of saying "you're trippin'"

An oldskool phrase.
Chump A: Man, that girl is fine.

Chump B: Your head's on fire dude. She's straight fugly.
by elevenxover December 13, 2008
Get the your head's on fire mug.
A term used to try and deflate the ego of that big-headed friend of yours
Chavtastic Boy 1: "Yo, bruv, there's no 1 better at Fifa 11 than me, no 1"

Chavtastic Boy 2: 'Oi, reduce your head boi, you ain't that good'
by ducky2410 October 27, 2010
Get the Reduce your head mug.
When you see a girl so thicccc that you pass out because all the blood in your body goes straight to your dick
“You I think the guy as No Blood to your head

“Yeah I’m about to too look at her ass man...”
by Tyrone911 January 9, 2019
Get the No Blood To Your Head mug.
To learn, gain knowledge, give the brain something to "feed" on.

This phrase is most popular in the Jefferson Starship song "White Rabbit"

It also may mean doing a lot a drug.
"Remember what the doormouse said.. "FEED YOUR HEAD."
by Panetta242 September 3, 2009
Get the Feed your head mug.
Verb, To give a thorough and proper disciplinary measure to an insubordinate little shit
Person 1: Bro, how did your date go?
Person 2: Shut up you fuck or I'll wax your head.
by RuralLexicographer April 20, 2015
Get the wax your head mug.