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
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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”
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to see if a guys shlong will fit in you
id size her up at times to see if id fit in her
When a guy looks a a girls thighs to determine if his thing will fit or not, if her thighs are bigger the harder it will be if they're smaller the easier it will be
"why you staring at her thighs?"
"just sizing up"
-hunnidmoji