A sexual act where a live caterpillar is placed between two docked penises.

The involved parties may, if they so choose, issue ejaculate while the caterpillar is inside, serving it as necessary sustenance when sufficiently ambitious sessions call for same."
Larry and Paul got bored with their same old docking sessions, so they decided to spice it up a bit and try silk-sheathing.
by Satch_Fan February 7, 2023
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He: I have to keep my urethral sheath warm & moist, will you help?
She: sure!
He: *thinks* "Score!"
by cyberpope67,BC,Canada October 16, 2016
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A lamb-skinned condom for ultra modern Catholics
The Netflix actor grabbed a Santorum sheath style condom from his nightstand.
by Coop Dupe April 24, 2017
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The act of putting on a prophylatic underneath one's trousers before going out one evening in anticipation of copulating

Often used by people who are inexperienced in putting them on

Also known as BGM
I was surprised when I thought he was handing me a banana in the club, but it turned out he had just been pre-sheathing
by k-ferriter April 30, 2011
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The act of taking a legitimate workplace abbreviation or acronym and turning it into a phrase that is nonsensical purely for the sake of a good hearted laugh that is victimless.
I think that workplace acronym (pfis) stands for Pre-Fire Illuminati Sheathing. Ahhh Mondays...
by ILoveMondays July 24, 2023
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