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A type of portable jar (complete with a cap) able to hold much water, and only water.
"The military uses water canteens which are put into pouches. Or should I say they used to. Now there is a straw beside them which allows them to move their lips sideways to slurp. Kinda nice, not to mention hi-tech, but let's hope it doesn't foster laziness."
-me
canteen by Dave June 28, 2004
The lunch room for the guy at the depot. The canteen is now Dum Dums (who is from whoreleons) turf. If you buy anytings from any other source (Glen), Dum Dum will scream at you until he is on the brink of a stroke. The main food groups sold at the canteen are Chucks, Twix saputo products and of course, toass. Some guy steals from the depot to run his grow operation.
"Guy, we have a viande in the Cantsteens today, because some guy steal from the cantsteens and some other guy put the toass in the wrong slots!"
canteen by John the old cleaner December 6, 2004
An uncircumcised penis.

(as opposed to Army helmet)
When I was in high-school gym class, most of the Hispanic kids had canteens and the white kids had Army-helmuts.
canteen by ferdii6069 June 21, 2016

canteen punk 

A prisoner who has sex in exchange for candy bars, soda or snacks at the canteen. Insulting term for a stupid or weak man or a homosexual.
Shit, don't pay no attention to Jimmy. He's nothing but a canteen punk, blow ya for a snickers bar.
canteen punk by Anonymous November 8, 2002

canteen grenade 

a common military anti boredom tool. produced when you take the mre heater and drop it into a half full, plastic canteen. as the canteen is air tight for chemical warfare purposes, the pressure will build until it explodes. not very devistating, but a very nice pop in the middle of the night!
"Why is Spc Dingleberry emptying all of those latrines?"
"yeah, he rolled an canteen grenade into Sgt tinydicks tent last night after he caught him having cyber sex with his wife."

"Damn."

Canteen Badges

Food stains on one’s clothing, letting you know what they had for lunch without you having to ask
Did you see the state of Ronnie’s vest, was covered in canteen badges’
Canteen Badges by Jess_Rabbit July 10, 2023