2 definitions by the Mad John Hess Man

A phrase used to denote a girl with a large ass, who is either dressed trashy or doing trashy things. Typically used insultingly or condescendingly, though “all ass, no class” is undeniably attention getting.
Bro 1: Damn, look at her ass! You see that thing sticking out?!

Bro 2: Yeah, but look how trashy she dressed. She all ass, no class.

Bro 1: I don’t care about any of that - that ass is calling me!

Or...

Bro 1: Lisa’s too innocent for me. She’s always wearing sweaters when I see her. She just look like she no fun.

Bro 2: Bruh, you ain’t seen her dance though. She may act like a biblical librarian in the day, but all ass, no class on the dance floor at night.
by the Mad John Hess Man July 28, 2021
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To make a large amount of poor choices with the people you sleep with when you’re young. Goes both ways gender wise, with differences in interpretations. A guy who’s “young, dumb, and full of cum” is essentially looking to have sex with any girl (or guy) he meets, or lets his dick do the thinking, often ending himself up in precarious situations that’s could easily be avoided had he just not been so focused on the sex. A girl who is “young, dumb, and full of cum” has essentially slept with a bunch of guys that, in hindsight, weren’t great guys to sleep with. The definition thus refers to the quantity of cum the person is either shooting or taking, and most often occurs in one’s 20s, hence the phrase, “Young, dumb, and full of cum.”
Guy 1: Why is he even talking to her? Everyone know she’s trash.

Guy 2: Ah, he don’t care. He’s young, dumb, and full of cum - he’s just looking to get his nut off in the closest chick that’ll have him.

Or

Girl 1: What were you thinking with Tyler, James, and worst of all, Chad? Everyone knows those guys are the worst.

Girl 2: I was going through a phase. I was young, dumb, and full of cum - all I saw was hot guys and didn’t care about their reputation.
by the Mad John Hess Man July 28, 2021
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