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7.
The exact moment of realization that you have done something insanely stupid.
I just left my keys in the car with the engine running! Ohshit ohshit ohshit ohshit ohshit!!!
by likeyehokwhatev October 26, 2005
 
1.
an exclaimation to be said with a very loud voice when you realize you have forgotten to do something very important such as:

1) Your Venn English Homework
2) You left your keys locked inside your car
3) You just trip and scrape both of your knees.
Friend "hey man can I have some help with that last question on our english homework?"

You "Oh shit! I left mine at home!"
by J.T. the Bible Scholar February 19, 2004
 
2.
Famous last words.
Ooh shit... *dead*
by RadicalHabit August 15, 2008
 
3.
1. An expletive expression used when a negative event occurs.

2. An expression used to indicate the state of being impressed.
1. "Oh shit! I just wrecked my dad's Saab after I piss drunk, driving 85 the wrong way down a 25, one-way street. Oh, I may have killed a hooker and a sick poodle, too.

2. "Oh shit! Did you see that African man jump that fence when the police sirens came this way?
by P. Dub July 27, 2006
 
4.
A statement used by manufacturers of flight data recorders ("black boxes") to alert pilots that there is 1/2 of a second of recording space remaining.
"Oh shit" was the last transmission heard on the black box.
by zabazuve-ha November 18, 2007
 
5.
Two well-know last words that are said
in an expression of:

1) Impending trouble- When you got a blunt in your hand,
and the po-po appears around the corner;

2) Chargin- When someone finds out a dirty secret
that involves YOU or you're losing in a game;

and/or 3) Catastrophe- at the last second before a
car crash;

EIther way, you are screwed, dude.
Example #1- Dereck had just rolled a fat ass blunt
on the corner when he saw the 5-O rollin' in like
bad weather. "Oh shit!" he thought as he dropped his
last fattie in to the sewer. The cops looked him over,
but Derek didn't get busted for possession.

Example #2- When Henry's mom found his web-blog,
all he could say was, "Ohhhhhhhhhh shit."

Example #3- *SCRRRRREEEEECCCCCHHHHH!!* "OH SHIT!!!"
was the last words that Susan said as her car crashed
into the guy's parked Beamer. If the collision doesn't
nearly kill her, the owner of the car-now-turned-hoopty
will, either with a tire iron or a lawsuit.
by Wallaroo March 13, 2006
 
6.
Something bad had just happened
Oh shit! The Wings got swept by the Ducks.
by Sabe April 18, 2003