Short for "semi-automatic."

1. (adj.) The characteristic, of a firearm, of being able to fire a single round for each pull of the trigger.

2. (n.) A firearm with this characteristic.

Commonly mistaken to mean fully automatic, which indicates a firearm most people would call a "machine gun," with which the user pulls the trigger a single time and holds it and the entire magazine is fired in succession, usually within a few seconds.
My Glock is a semi-auto with a 10-round magazine, so if I want to fire ten shots I have to pull the trigger ten times.
by ed July 26, 2004
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At fault for word(s):

It’s an assist to the scapegoat when officially yet unofficially calling a spade a spade. It’s kind of like saying “mybad” but this is a definite upgrade and carries a very official sounding apology. This single multi-excusable word can be used in any fashion so utilize in your arsenal of doubt or direct conversation.
situation:
Texter 1:yo you bringin the whore over.

Texter 2: WTF?

Texter 1: Damn you AUTO-CORRECT, I meant to say "it would honor us if you bring your lady over to enjoy or join in on our festivities."
by StyleDogg October 28, 2011
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The worst thing in the history of man. When your iPad, iPhone, or other devices with autocorrect built in changes a word to something that doesn't make sense.
I heard mom got stung by a few bees this morning, is she ok??? Hospital???
She's ok now. No hospital. She had to take the deep penis.
Uhhhhh... What?
I had to inject her with an EPIC PENIS. Oh for Christ's sake, this auto incorrect. Epi Pen
by old handle July 6, 2014
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This term is usually used in Counter-Strike games, but basically means whenever a player has a fast shooting Sniper Rifle for example sg550 or G3/SG-1 and shoots other players usually who are skilled, but still fail to kill the player will usually will try to insult them. Which results in funny or also insulting remarks. Noob in definition might mean you might be doing something wrong, but as long as you kill the enemy and do your role as a CT/T you did nothing wrong.
Hahah fucking auto noob
He used the auto and scoped with it thats sad
stop using the auto you fucking noob
by Counter-Strike: Words July 2, 2016
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The most frustrating setting on your phone, usually changes words to something embarrassing.
Me: heyy
Friend: hey how's ur day?
Me: awful I gotta bad case of the manboobs
Friend: OMG LOL
Me: what
Friend: check ur first text
Me: omg I mention Monday's! lol I hate auto-correct
by TheCandyDirectioner October 12, 2015
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When you blow your own mind.
I performed auto-epiphellatio when I figured out I could make grilled cheese by turning the toaster sideways.

When I came up with the word epiphellatio today, I had an auto-epiphellatio.
by reallifecartoon July 22, 2015
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