The common connotation is of a person who speaks Chinese with an American accent, English with a Asian accent, and can't use chopsticks properly.
Most likely forced to pick up the piano or violin at a young age and/or sent to Chinese school. Often pressured to attain perfect SAT scores or straight A's in school.
ABC: Um...er....Ni how ma? ^^;;
Chinese person: Aya~ You are ABC.
Blake: A.B.C. A-always, B-be, C-closing. Always be closing! Always be closing! A.I.D.A. Attention, Interest, Decision, Action. Attention -- do I have your attention? Interest -- are you interested? I know you are because it's fuck or walk. You close or you hit the bricks! Decision -- have you made your decision for Christ?!! And action. A.I.D.A. Get out there! You got the prospects coming in; you think they came in to get out of the rain? Guy doesn't walk on the lot unless he wants to buy. Sitting out there waiting to give you their money! Are you gonna take it? Are you man enough to take it?
--Glengarry Glen Ross