Noun, can be used as a verb in some situations.

Masturbation. Similar usage to a Number 1, or a Number 2.
"You caught me taking a number 3"

"I've gotta go number 3, brb"
by Jacp123 March 10, 2020
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To masturabate, jerkoff, or rub one out. The action of releasing a load of nut juice.
Damn boys it's been fun but it's getting late and I really gotta take a number 3.

A number one is to piss a number 2 is to shit so a number 3 must be....... To bust a nut
by Therealslimanus_cheech-o January 24, 2022
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