When you take five hits to get really high. Another form is when you want to ask someone discretely if they wanna get really high.
Person 1: Wanna High Five?

Person 2: Sure
by JD M. January 28, 2021
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The signal for the delivery of a stork to deliver a baby to the girl you were just with.
by Sith_legend04132 April 19, 2016
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What you verbally give your work-buddy when something you're attempting goes right, but you're currently "all yucky-messy" from the dirty/disgusting job you're presently engaged in, and so you don't wanna soil him by actually slapping his still-clean palm (i.e., he's not actually handling the greasy/muddy/gloopy items the way you are, but he's still providing needed assistance; perhaps he's aiming a trouble-light, occasionally actuating switches/buttons and/or operating other controls to test the device you're repairing, holding items like drapes or hoses/cables up out of the way so that you don't accidentally soil/damage them, etc.) with your icky hand. "I'll slap palms wif ya later, Pal, after I get washed up some --- consider yourself high-fived for now!"
A high-five rain-check can be a similar situation to a delayed hug, handshake. back-clap, etc... in all of these instances, you are merely postponing an appreciative/affectionate/encouraging/celebratory gesture until a more appropriate/convenient time. If you strongly wish to have the pleasant action administered right away, however --- such as if you feel that the person deserves immediate reward/gratification because of the exceptional effort/bravery he put out, or if he has to leave shortly --- a proxy-hug can sometimes be an adequate/reasonable option, provided there is an agreeable bystander present whom you can request to "do the honors" in your place.
by QuacksO August 30, 2018
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The high five given after going skiing with your bros and the town's favorite whore.
Dude, remember the legendary high five we did last night after kelley beat us down the hill when we all went skiing?

Dude, so word.
by TittySlamSwag July 8, 2011
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The high five means that they think that there smarter, taller, or just better. It usually starts with “Gottem”. If you hear this you need to stop them. If they high five they probably just made a stupid joke or made fun of you. Why I do not know they are another species entirely
Max and Trevor’s high fives sucks
by Aaaaaaaaamkkkkkk November 14, 2019
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where two males bang a female and as one is hitting it from the back the other is hitting it from the front and they high five over the girl creating a triangle as a pyramid
me and bob had a pyramid high five over a babe
by asdlkjlas January 28, 2017
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