1. Explains what normal english words cannot explain. Usually only used within cliques or groups, whereby people understand each other to the extent that the word abc conveys messages more powerful than any other words can.
2. Stupid ol' filler text.
Abbreviation for "Always be Closing". Describes the ability and frequency of having sexual relations with multiple partners the first night you meet them.
Friend 1: "You think your luck will continue at the Hang Nail Lounge tonight? You have to be running out of girls you haven't banged their yet"
Friend 2: "My streak will continue. You know me, abc!"