teletypewriter (originally), or a text display device, as used by the deaf to read voice communication converted to text by a communication assistant device (CA).

(text messaging, Internet slang) Initialism of talk to you.

plural of TTY

Initialism of talk to you soon.

(Internet slang, text messaging) Alternative letter-case form of TTYL.

(Internet slang, text messaging) Initialism of talk to you later.

(Internet slang, text messaging) Initialism of talk to you tomorrow.