Someone who is completely straight-up, clean, and normally is oblivious to things such as popular slang, and the pop culture involving drugs, alcohol, sexual promiscuity, and such.
cool kid: "Dude, i got so slammed last night that i went to third with that nerd in my biology class!"
straighty one-eighty: "What are you talking about? slammed by what? and where's 'third'?"
cool kid: "Man, you're such a straighty one-eighty."
N.
1. A womanizing man who hits on a gay man's female friends.
2. Slang used in homosexual communities for the epitomy of a straight man; a ladies man.
A noob, dweeb or geek that plays everything by the rules, knows every book off by heart, but is a total douche bag in society.
1) Matt: Hey, how come Peter never comes out to party with us anymore?
Jane: He's stuck in his room doing his english papers. He's such a fucking straighty 180.
2) Phil: Daym, I can't believe Mya's going out with that douche bag. She's way too hot for him!
Matt: Doode, what do you expect? He's studying law. Fucking striahgty 180.