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?