Forty Five caliber pistol, generally the largest caliber (and therefore potentially the most deadly) available in the US.
Man, you hear Fitty Cent got shot 9 times with a four five? He lucky he still walkin!
by JMKinMich March 10, 2008
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When someone gives your fourhead a high five.. they Slap you really hard on the head they yell four-five
Person one: Yo high five mayne..
Unsespecting victim: Yeah Boy

**Person one: Slaps vcitims head and yells FOUR-FIVE BITCH
Victim begins to cry and walks away
by Mary June 14, 2006
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When someone gives your fourhead a high five.. they Slap you really hard on the head they yell four-five
Person one: Yo high five mayne..
Unsespecting victim: Yeah Boy

**Person one: Slaps vcitims head and yells FOUR-FIVE BITCH
Victim begins to cry and walks away
by Mary B June 19, 2006
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David: Bro, how much did you drink last night!?
Troy: Dude, I pulled off a three four five.
David: Your were shit faced.
Troy: Fuckk.
by Dwood93 June 26, 2011
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Boss: Jim, the deadline for the Jenkin's report has been moved up to Tuesday.

You: Ah, four five six!

Boss: What?
by Douche Toilette August 17, 2008
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A combination of a normal slap, proceeded by a backhand.
can either be done with singular strokes of each type of slap, or a multiple procession of both actions, back and forth.
hey! come back here, or I'm about to give you the five-four!
(grabs)
*slap slap slap*
by GNK June 09, 2009
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The short girl that always says controversial stuff. She always says to fight her when you can legit punch her across the room. She always gets mad when you call her short and claims to be "average height"
Person: What's up shorty
Five Four Dinosaur: I'm average height *holds up tiny fist* FIGHT ME!!
Person: *grabs her big forehead and flings across room*
by Linguini Houdini December 11, 2019
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