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A military term used for a male-male-female threesome in which the woman is providing oral sex to one man and vaginal or anal sex to the other.

The term is derived from the C-5 Galaxy aircraft, which has a hinged nose in addition to the aft cargo hatch. As such, the aircraft can be loaded from the front and the rear.

For a similar act, see the Eiffel Tower.
We did a C-5 on Jill last night, she wanted to get loaded from the front and back.

Jill was doing a C-5 with Jack and me last week. We loaded her from the front and the rear.
by Buggermy August 18, 2009
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A radio transmission in Counter-Strike, meaning:

I'm in position,

but said in normal life
c5, c5!!! wtf?
by Lorne Richardson July 06, 2003
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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."
by GCSRT8 September 24, 2011
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