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:"..."
A "human" that spends so much time playing video games that their posture is level nerd neck. Everytime anyone goes tryhard they hunch down and their neck gets longer there fore a nerd neck is always hunched down cause they're always going try hard. In other words a nerd neck is a try hard, since their neck is 100% longer than the average human being due to playing too many video games and taking them serious, nerd necks are not even considered human anymore but something more sad. Nerd necks are often found on fortnite, their natural habitat usually being tilted towers.