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An acronym for "Shut your titties, bitch!"
Me: SYTB
Girl: ok *shuts titties*
An acronym for "Shake your titties, bitch."
Guy: SYTB
Girl: Okay, lol. *Shakes titties*
Save Your Thumb Breath.
Meaning, I'm not paying attention to your text messages.
SYTB, you can't talk me out of it.