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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
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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
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