Diclaimer: I often only swear when playing video games, I'm not really abrasive towards people, I just hate them.
1. "Aw crap" or "AW CRAP!!" The former defines a looming danger, I use this in place of "this is gonna suck" sometimes; the latter means shit just got real and I am going to fucking die!
2. "Shitshitshitshit" When something is chasing me, I'm running out of time, or when the game decides to be a dick towards me.
3. "BULLSHIT!!" When the game pulls a fast one on me because of circumstances outside of my control.
4. "Oh what the fuck?!" or "What. The. Fuck." or "what the.... ummm, fuck?" = essentially, "WTF" The quote I use most often in day to day life, usually when I can't comprehend something, something strange just happen, or if I'm just not sure what curse word would be most appropriate for a situation.
EDIT: 5. "Goddamn it" Almost forgot this one, I use it also in daily life; whenever some goes wrong, enough to get me irritated, but JUUUST not enough to piss me off.