A synonym of the word condom, which is a rubber *sock* which covers your cock while fucking. The most commonly used method on contraception after anus as it can be hidden in many places such as:
1)in pant pockets
2)in shirt pockets
3)in coat pockets
4)in wallets
5)in shoes
6)under a cap
7)between the penis and the testicles(for a male
8)between beaver-flaps(labii)
9)in a condom box
10)in your mouth 11)already on your penis.
A fucksheath can also be used in many other uses other than a contraceptive, such as:
1)a jizz-bucket
2)a baloon
3)a water baloon 4)a hat
5)a projectile
6)a term paper
Jane:"Did you bring the fucksheath?"
Joe:"Dammit!FML."
Jack:"Why are you walking funny like that, John?"
John:"I've got my fucksheath already on my cock in case shit happens."
Jack: "Don't worry. Sally wouldn't actually take a dump on your dick, man."
John:"..."
When you are urgently going at it but suddenly someone needs a glass of water or to pee, then you go right back to it. You just took a fuckbreak.
We were going for it like rabid weasels, but she said 'Hold on, I need a fuckbreak' so while she went to the bathroom I drank a glass of water, and then I returned to fucking the shit out of her.