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.
The chain reaction caused during the last 10-15 seconds of class when someone loudly zips their backpack, this in turn causes everyone a..