The process where a person on Facebook posts their status as a letter, either starting by A or a random one. A random person comments on their status the next letter, and usually goes into a cycle where said person and the OP share the next letter.
If someone breaks the cycle, such as posting something unrelated to a letter, the game is over.
Kelly: A
Anna: B
Kelly: C
Anna: D
Fred: What are you guys doing?!
Kelly: Darn! The ABC Game is over!
To ramble on about unrelated, possibly racist, subjects because you cannot express your opinions in a way other than to be upset by things that would not upset a normal/reasonablehuman being.
After he found out my friend was Mexican, he proceeded to tell me about how the education system is letting down our country and proceeded to rap the ABCs at me.