KID

A form of expressing extreme laughter if "LMAO" or "LOL" is not enough for you. The more "Ds" the "KID" has, the funnier the joke was. If one says "kid" (no caps) then your joke was not funny in the slightest, or the other fellow is concerned or confused.

insert mildly funny sentence here
"KID"
insert VERY funny sentence here
"KIDDDDDD"