This is a distortion of an old expression: "adding insult to injury". The original meaning was that it's bad enough to be physically injured by someone, without receiving a verbal insult from the assailant as well.
"As if getting my parked car hit by a truck wasn't bad enough, the car being towed away by the parking police was just adding injury to insult."
Retard "If you're going to insult my intelligence-"
Hym "INTELLIGENCE!? AHAHAHAHAHAHAHAHA! OK! WHAT INTELLIGENCE!? HA! Yeah! Look guys, if you're going to insult my big fat cock, I'm just done with you OK? If you're going to insult my giant dick... I'm gonna be supermad about it, OK? Ahahahahahaha!"
A statement you say out of pure anger after two fat dudes working a pawn shop only offer you $1,000 for your $2,500 PEZ collection.
"I can't believe one of them guys offered me a thousand dollars for fucking 50 pieces of PEZ, that's an insult to the PEZ community. I can't believe it; that's why they're chooches."
I want to set on you on fire, but my mother doesn't allow me to burn trash. That is the perfect insult to your enemies(WARNING: DO NOT TRY THIS AT HOME, YOU WILL GET GROUNDED).