1. Clearly defined or drawn.
2. How idiots across America spell "discreet."
1. I took a class in discrete geometry. It was mostly about clearly-defined lines and points.
2. "i am luking 4 a hott discrete chik or 2 2 blo me while my wife at her moms funeral."
indicates lying or being evasive about one's personal relations.
Romeo told the attendants this to indicate they were NOT the Juliet he was looking for, but he wouldn't mind a blow job while he was looking.
"We're very discrete" means we keep our personal relationship behind closed doors.
Usually, this is a very bad sign of things to come. Run while you still can.