sized up

A way of saying a man got a boner, stiffy, erection, etc.

Sized up is a play on the phrase 'siezed up'.

when you look at someone’s thighs to see how far your 🍆 will fit inside them.

The act of checking someone out to see if you can take them in a fight

to estimate or assess someone or something

The phrase "size up", usually used in arguments, essentially means to "stand up and fight"

The act of looking at someone and determining if you could take them in a fight.

To get a feel of someone's strength by observing them or a call out to get someone to fight you

This pretty simple term which was then redefined by tiktok idiots into: When a man looks if his dick will fit by checking out a girl's thighs.