Deceivingly flirting but then not flirting immediately after, due to lack of consistency. This may occcur in a situation with "new" flirtations.
Girl likes Boy, Boy thinks he does and then backs off. Observe:
Boy: "You're so beautiful"
Girl: "Aw, thanks"
Boy: "*ruffles your head* Love ya kiddo"
Girl's Friend: "haha he was totally antiflirting..."