cryptosarcasm
Cryptosarcasm (n.): The art of making a remark so unexpectedly and ambiguously complimentary that nobody can be sure whether or not one is being sarcastic.
Phil: John commented on my photo earlier saying "This photo of you looks Really nice." which goes against his personality a little. I can't tell if he's being sarcastic or not.
Ben: Cryptosarcasm strikes again.
Ben: Cryptosarcasm strikes again.