An expression of extreme suprise, excitement, love, and/or fear. It is often found conjugated with the words yes or no after its main context.
Eve: Here take this apple!
Adam: *munch* wait a second... oh fuck...
Captain Adama: The Cylons look like us now.
Starbuck: Oh fuck!
Girlfriend: Honey I think its time we had sex.
Boyfriend: Ohhhhhhhhhhhhhhhhhhhhh Fuck.
Teen 1: I heard Obama's goona legalize pot.
Teen 2: Oh fuck!
Parents: Oh fuck...
An exclamation of immense frustration and awe an overpowering catastrophe that is about to happen.
mate: Iceberg right ahead!
captain smith: oh fuck!
alpha wing: bombs away!
guy at nagasaki: oh fuck!
stormtrooper: they are at the gates of berlin
hitler: Oh fuck!
Obi-wan: here comes Jar Jar again
Qui Gon: oh fuck!
1) used to describe a dangerous person, one who is so violent, he is simply named "Oh fuck"
2) the last thing uttered before something unfortunate happens to you, particularly to your bottom.
"who is that? Why's he comming over- OH FUCK!"
A term not unlike the oh shit, but with an even greater degree of negativity.
1) You were given an assignment to do over the long weekend that's worth 15% of your final grade, and you completely forgot about it.
2) You secretly started dating your teacher and your parents ask you to bring them over so they can meet.
Parents: I expect you to bring your date home tonight, no excuses.
You: Oh fuck...