To open up, as in to stab/knife someone.
The opening process can be as simple as a minor poke but generally involves heavy bleeding and multiple openings. The more insane openings consist of using your bear hands/fingers to perform the opening process.

"I finna open you up like a damn can-o-tuna, you fat slut ass biotch."

Open up by MopDawg December 30, 2003

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OPEN-FACED COCK SAMMICH SMOTHERED IN UNDERWEAR

a perennial favorite amongst all "peter-puffers" and "pickle sniffers." When they're in the mood for Asian cuisine, they opt for the ultra-chunky "Chinese Gay Soup."

Stephan and David ordered the lunch special at the "Buttlover's Bistro" --
the plat du jour was the Open-Faced Cock Sammich Smothered in Underwear." After lunch, they returned to their suite, as Stephan had a hankering for roughage and tossed David's salad.

OPEN-FACED COCK SAMMICH SMOTHERED IN UNDERWEAR by weave October 28, 2003

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open mic

a blowjob given to a man while he is performing a musical instrument. It has become a bit of a fetish among some women, given most often to men playing the guitar while laying horizontally.

Last night my girlfriend gave me an open mic while I played Bob Dylan tunes.

open mic by Groovintunes March 31, 2011

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open field

To introduce a woman to a sensual encounter without the necessity of walls, fences or other such encumbrances.

Me: Evan, I heard you got back from camping. Did Marge go with with you?

Evan: You know it. I open fielded that stand up lady.

open field by Phil Foolery June 21, 2010

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