GG - I don't know if this is within just the Asian community (and I mean Asians that grew up in Asia) but I sometimes hear my Asian friends use GG to describe an unfavorable end of a moment or event by some degree of failure.
For example: - Two Asian kids walked out of the exam hall after a ridiculously hard exam. One of them turns to the other, shakes his head and says "GG".
- After spending hours in the mall searching for the dress his girlfriend wanted him to buy for her birthday, he says "Okay I give up I'm outta here, GG."
C-C-C-COMBO BREAKER - In message boards usually in internet forums, when someone breaks a chain of people repeating the same phrase, it is considered a c-c-c-combo breaker. This phrase came from Killer Instinct in which you could stop someone's combo right then and there.
Sheila: I'm just saying, guys are generally terrible at keeping their apartments clean.
Chris: I. AM. OFFENDED.
Jess: c-c-c-combo breaker!
This term could be used more generally though when a chain of posts is broken.
Jenna says: I
Jenna says: l
Jenna says: o
Jenna says: v
Jenna says: e
Jenna says: y
David says: C-C-C-COMBO BREAKER!
Jenna says: What the f*** is your problem?! You always do that!
Any other examples guys?