THISH (T.H.I.S.H.)
Tell him/her I said hey has been replaced by the acronym THISH for use in most forms of electronic communication (i.e. instant messaging, text messages, email, etc.)
Text message examples of THISH (T.H.I.S.H.):
Person A: I'm going to hang out with Patty tonight.
Person B: THISH!
Person A: I'm going to hang out with Patty tonight.
Person B: THISH!