What is Zac Efrony?
1.
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!"
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1.
A relatively common disease of HIV positivegay men (rarely heterosexual women) who practice both receptive anal sex and oral sex("A..