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12.
Used often in First Person Shooters when someone acheives a one-hit-kill.
Guy1: Dude, I totally one shotted that guy
Guy2: Bro, that was me.
Guy1: Lol

Guy1: Did you see that oneshot I just got?
Guy2: No, I was worrying about saving my own ass.
Guy1: Lol
by I Am EpicFailGuy January 11, 2009
 
1.
A term used in fanfictions to say that there will only be one body of text. (One chapter)
"Severus Snape struggles to find his way, and redemption, after the war. One shot."
by Domccus June 29, 2006
 
2.
Refers to fanfiction, which means that the fic is one chapter long and will not be continued. Mostly canon.
Hey, should I continue my oneshot, or leave it as is?
by akurokuu August 22, 2006
 
3.
Writing about a character, place or thing that has been done on a spur of the moment of a fandom or orginal peice. Usually is to short for a short story consisting of only one chapter.
'The writer did a one=shot of Mike's feelings toward his parents.'
by lgbird April 28, 2005
 
4.
A term used in fanfiction literature by the authors writing a single chapter. Somewhat Similar to a short story used in regular literature.
One shot--We went through and through and came out blank.
by Saggeebush ! December 18, 2008
 
5.
When a person is knocked out cold, with one punch. Typically "one shot" is delivered from a juicehead with a running start. One shot can result in an overnight in the county jail.
"That's one shot kid, one shot!"
by Blakey D March 01, 2010
 
6.
-verb

In video games, to kill an opponent with a single shot or blow.
1. My character is so stacked, I can one-shot every boss in the game.

2. I've been one-shotting n00bs all day with the WA-2000 on MW2.
by reese456 May 06, 2010
 
7.
A term used in Halo 3 Team Multiplayer matches. When an opponent has no shields and is on the verge of death. All it takes is one more shot to finish him/her off.
1:
1st Guy: Over at sniper tower, he's oneshot.
2nd Guy: Got em.
1st Guy: Niiiiice.

2:
1st Guy: WTF dude, why didn't you finish him off!? He was oneshot!!
2nd Guy: I didn't see him you f*cking *sshole!
by Seoul Style March 10, 2008