g'ed your mellon
You shout it when someone insults you and someone nearby hears it and now they're both mad at you.
"He said my hair is a mess. I'm gonna cut him!", said by a girl with messy hair.
"She said my dad is a pickle. I'm gonna punch her!", said by a dad who hates pickles.
"He said my pizza is the worst. I'm gonna eat him!", said by a kid who loves pizza.