Your hairline is so far back that your dad still can't find his way back home.
Receding Hairline
Explanation
This is a roast, making fun of someone's receding hairline by exaggerating how far back it's gone, implying it's so far back that it's like a point of no return, not even allowing the dad to find his way home.
Anonymous
Your hairline went missing for so long people put Amber Alerts on.