A homiewrecker is a bro who won't let you date a girl who 'just wasn't good enough for you, man'. The deference between a homewrecker and a homiewrecker is that it is a selfless action done for your homie instead of for yourself.
Jake: "What the fuck dude! I liked her!"
Kev: "Hey, chill man. I did this for you. She was using you as a meatstick. You deserve someone who appreciates how smart and funny you are."
Jake: "Kind of getting a gay vibe here bro, but what you're saying is you homiewrecked me."
Kev: "I homiewrecked you. No-homo."