An acronym for the phrase Working Towards The Weekend. Typically, used when one does not want to think about how many days are actually left of the workweek.
Bob: How 'ya doin' Mando?
Mando: I'm crashing and burning!
Bob: Be cool man, just keep wttw...
An abbreviation of the suggestion; Take-It-Easy
Person 1: This is terrible I dropped my laser pointer down the well!! MY FRIEND IS GONNA FREAK!!!
Person 2: Whoa man, T.I.E.!
Person 1: How does a tie have anything to do with my problem?!