Lingo short for "class 5" used by Canadian Tire staff to signal to each other of a hot female shopper.
There are different types of C5's, for instance:
C5-code L = Latina
C5-code M = MILF
C5-code LG = Little girl
C5-code P = Pregnant
C4 = Not as hot as C5 but still worthy to point out
C3 = Decent
C2 = Put a bag over that shit!
C1 = Why are you even pointing her out?
1. "Yo Chris check out that C5 code LG down aisle 3!"
"Dude, way too young!"
"Give her a few years, she has potential"
2. "C5 aisle 9"
"I'd say she's more of a C3, but I'd still bang her."
A radio transmission in Counter-Strike, meaning:
I'm in position,
but said in normal life
c5, c5!!! wtf?