Top definition
Four-Oh is shorter way of saying "4.0" grade point average. In many American schooling systems, a student will get a 4.0 grade point average if they receive all As for all classes, all four years. Thus, the 4.0 GPA is a symbol of a student who has sold their soul to the devil to achieve perfect marks and will likely get into a renowned college.
"Is she really applying to Harvard?"
"Yeah, she's a four-oh so she's gotta aim high."
by exogenesissymph March 20, 2016
Get the mug
Get a Four-Oh mug for your Facebook friend Rihanna.
The word is used to describe anything and everything that fits the phrase "bomb as hell".

Derived from the word "chill", as 40 degrees Fahrenheit is a pretty cool temperature; Four-Oh can replace the word "chill" or "cool" in any situation.
1."damn dude your car as dank as hell"

"yeah bro, pretty Four-Oh, huh?"

2. "Dang dude, we've been straight up loungin' for hours

"Yeah, today's been sooo Four-Oh"
by zsteezy September 03, 2009
Get the mug
Get a Four-Oh mug for your grandma Beatrix.