It is a type of slang and or "decode" in which people can communicate with another without letting others who shouldn't here the current conversation, or who the conversation could be about be knowledgeable of of even if the person being talked about is present.
Somba: "ummmm..nah ur on crack"
Dan: " *laughs* well i couldn't really see"
Somba: "nah u lost points for today & tomorrow" (meaning he lost cool points for false claiming a good looking female for one that wasn't)
Dan: " wrong my decoders won"