Zac Efrony
One who exhibits a hairy belly button area, such as the one Zac Efron sports on the cover of Rolling Stone.
"Hey Timmy, you see that guy over there playing basketball without his shirt on?"
"Yeah..."
"His belly button is so hairy, that's what you call Zac Efrony!"
"Yeah..."
"His belly button is so hairy, that's what you call Zac Efrony!"