A criticism or insult disguised as a compliment.
A compliment with two meanings, one of which is unflattering to the receiver.
Also called backhanded compliment
Patti sees Britney wearing a sexy new dress. Patti, who really doesn't like Britney, says, "That dress is really sharp. It really makes you look so slim!" Left handed compliment: "You're fat, and that dress makes you look like you're trying to hide it."
"Boy, you're pretty hot... for a fat (or skinny) chick!" Left handed compliment: Self-explanatory