Answer:

TTYL

AnswerCrossword Clue
TTYL"I'm Audi 5000," in txts
TTYLTexter's "bye for now"
TTYLMessage sent before going AFK
TTYL"bye 4 now"
TTYLTexter's sign-off
TTYLIM sign-off
TTYLOn-line sign-off (abbr.)
TTYLTexter's "until next time"
TTYL"Until next time," in IMs
TTYL"Until next time," in texts
TTYLTexter's sign off
TTYLTexter's toodle-oo
TTYLClosing letters
TTYLText messaging sign-off
TTYL"Gotta go," in chat rooms
TTYLTexter's "bye now"
TTYLTexter's "ciao"
TTYLTexter's ta-ta
TTYLModern farewell letters
TTYLTexting ta-ta
TTYLWhat best-selling 2004 young adult novel was written entirely in the form of instant messages?
TTYL"Bye for now," in textspeak
TTYLQuick goodbye?
TTYLSign-off in texting or cyber speak
TTYLTexter's farewell
TTYLTexter's bye-bye
TTYLTexter's valediction