Receding Hairline

This is a playful insult. The speaker is suggesting that the other person's hairline is receding so far back that the person can follow suit and take a step back physically.

• Hairline
• Man
• Step
• Baldness
• Appearance
• Physical characteristic

• Your hairline goes so far back, your forehead got a six pack.
• Your hairline reminds me of a car taking a U-turn.
• Your hairline!