jack one in

To cock or load a round of ammunition into the chamber of a weapon.

My gun was unloaded, i forgot to jack one in.

by MarkXIX November 16, 2007

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Jack-asshole

Noun. One who is simultaneously so idiotic and such a jerk that s/he goes beyond just "jack ass" or "asshole" to a combination of the two.

Also related: jack-assholery.

Did you see that truck taking up four parking spaces in the lot? That guy's a real jack-asshole.

by holacrr July 18, 2013

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Jack Cap

A protective sleeve made to go over the "jack" of instrument and other cables to keep them from getting damaged and to maintain sound quality.

I just picked up a new guitar chord and it came with Jack Caps for each end.

Wow, my chord is coming apart at the jack, I wish I had some Jack Caps to keep that from happening.

by Picker's Plus July 18, 2016

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