Acronym for Scotty Doesn't Know. Can be used in place of I don't know (see idk). Especially effective for people name Scotty, or from Scotland, or the chief engineer and third-in-command on the starship Enterprise.
Guy: Hey, who used my toothbrush?
Dude: SDK.
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Acronym for Wiggling On Floor Laughing.
Guy: I have herpes.
Dude: WOFL!
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Acronym for "laughing out loud but not really". Because how many times are you actually laughing out loud when you type "lol"?
Exactly.
Guy: ...That's what she said!
Dude: LOLBNR