The outer covering of an animal's penis. It serves as protection for the penis. It can be found on most mammals save for humans and apes. In other creatures a genital slit serves the same purpose (dolphins, whales, reptiles). The sheath can also be referred to as the prepuce or foreskin, all terms are synonomous.
The stallion's sheath was full of smegma and needed to be cleaned very badly.
by B-Wolf November 20, 2006
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the cover for a sword save the hilt and guard that prevents you or others from accidentally getting cut
qaz:*slaps varg with sheathed sword*

varg:crap! that would've cut my head off if it wasn't sheathed!

qaz: :3
by ykcir00222 November 9, 2009
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I sheathed my sword to have safe sex.
by KawaiiAnime October 27, 2003
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A sexual act that is performed by placing the penis inside of the vagina and not performing any further action. It is customary to set up a buffet table next to the bed so that neither party becomes hungry during the often hours-long ordeal. One is not allowed to call or text while sheathing, as sheathing is the ultimate sign of commitment towards a sexual partner. It is perfectly fine to sleep while sheathing. The sheathing ends when: the penis becomes pruned; either party has to urinate, because the result of urination while sheathing would be like putting a thumb over a hose; death of either party; the end of the relationship between the parties. It is not permissible to orgasm while sheathing.
Mark's heart was filled with joy when his girlfriend asked if he would consider sheathing with her.
by Umbrelladump January 15, 2010
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v. To have sexual intercourse, but connoting female empowerment in the act.

n. A vagina
v. {girls drinking tea and reading cosmo together} "Sally did you and Tom, you know...?" "What, did I sheath him? Hell yeah I did. I sheathed him good and dirty."

n. "Sally, I want your sheath" "Ok, Tom, here it is."
by A.F. Eminist November 15, 2008
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adj: Describes a particularly shiny and soft head of hair.
Arul: Your sheath is looking prime today.
Laura: Gee, thanks! I washed it last night!

Maddy: Do you think I should cut my hair?
Laura: No leave it as it is, it's such a sheath!
by lozenge April 1, 2013
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How my sister's friend refered to her horse's penis foreskin.
Sarah: The vet says your horse needs it's sheath cleaned. He can do it but I'll show you how to do it your self, it's cheaper. *wink*
Meliisa: *grins and follows her into the barn*
Me: looks at paper that clearly says "foreskin" not "sheath" *gags and runs behind hay bale*
by Jerk October 22, 2004
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