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1.
Boxer shorts. (See also Gun).

The term is sometimes mistakenly used to describe a vagina.
"I can't stand up yet man, I've got a loaded weapon in my Gun-holster"

"I need to go to Primark to buy a Gun-holster"

"No you dick, that's not a Gun-holster, that's a quim"
by absolutejw January 23, 2010
 
2.
(n.) Either of the womans' two lower orifices, where the 'gun' is put.

(v.) To put the gun into the vagina or anus of a female.
What a nice gunholster!

I'll gunhoster you!
by Gumba Gumba May 29, 2004