What is Comethefuckon?
1.
An expression of surprise and/or skepticism
When Lafawnda told me she'd won the lottery and would be moving out o' her momma's house, I said "Comethefuckon! You really won the lottery?"
When Terrell said he was goin' marry his baby momma, Jermaine said, "Comethefuckon! You really goin' marry that ho?"
See