when something is a compliment AND an insult, at the same time. ;)
*Talking about an ugly person*
Friend 1: "Don't worry, you're not as ugly as her"
Friend 2: "Oh, thanks."
Friend 3: "That was a complisult..."
Friend 1: "Oh yeah..."
"You can do much better than him!"
(That is a complisult because they are saying that the girl deserves more, but they are insulting her boyfriend at the same time.)