To evaluate your opponent before a fight
“What are you waiting for, get on it
“I’m sizing up.”
by Jtrevo July 25, 2021
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Basketball term usually used to gauge one defenders ability
What’s he doing with the ball
He’s sizing up seeing how he reacts
by YungDraco July 25, 2021
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when a guy examines a girls thighs in order to see if she can take dick from him
have you seen her? i think i need to size up. not sure if she can take me. we are sizing up
by August 15, 2021
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When a guy looks at you thighs to see if he would fit
When you size up you know the bigger the thigh gap, the looser it is
by Toryyuuuu July 17, 2021
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A way of saying a man got a boner, stiffy, erection, etc.

Sized up is a play on the phrase 'siezed up'.
Alexa: I came twice in a row thinking about last night

Jordan: Dayumm I just sized up hard
by Alexob April 6, 2014
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when you look at someone’s thighs to see how far your 🍆 will fit inside them.
“dude, i sized up my girl the other day. that sh¡t would fit all the way
by arf arf arf July 23, 2021
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To compare hand and finger sizes, leading to the comparing of other certain extremeties. This is a command given by one who is insecure about his manhood, and wants to reassure himself that he is as normal as anyone else.
Travis: "Size it up!"
Todd: "Stfu Travis."
by Lee Brody March 11, 2009
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