'Sup' is simply a shorter version of what is up. If you say it quickly you will say sup. This shut so getting boring now so im going to stop.
by Qwerty key bored March 4, 2019
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Sup is a shorter way of saying What’s Up

Frickin stupid dude the sky’s up you dumb frick
by BIGCHUNGUSSSSSSS January 23, 2019
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A term that cool people (expect Mijalli) use because they are too damn lazy to say What's up. (Too much effort involved there man.)
by Human maybe April 1, 2016
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A common greeting that has an ambiguous meaning which leaves the recipient confused and uncertain on how to respond.
Person 1: Sup.
Person 2: Uhh... wait am I supposed to say 'sup' back or am I supposed to tell you how my day went?
Person 1: uuhh... idk.
by StuffTheChicken420 October 21, 2021
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A text message you send to someone to let them know you want to talk by phone, but do not want to call the other person without warning, usually because of the time of day and the fear of outright assault by ones wife. Can be used alone as a single word or as part of a compound word with other words added to it, such as supdog, sup-per, sup-foo, etc.

Sup requires either a return phone call or a ready why the other party can't talk at that time. Ignoring a Sup is an indefensible violation of the bro code.
Sup is not used in a sentence.
by Clard August 26, 2017
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A shorter way of saying 'what's up?'
Person 1: Sup, bro?
Person 2: not much, bro.
by D€€z Nut$ December 25, 2015
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