US /ˈzɪpɚ ʌp/
・UK /ˈzɪpə ʌp/
Stumble 'round town, pull your zipper up
"Your fly is down or your fly is open." This means, on your pants where your little weenie comes out, or where you unzip your pants-zip-it means you forgot to do the zipper up or the buttons up on your pants.
This means on your pants, where your little weenie comes out or where you unzip your pants—zip—it means you forgot to do the zipper up or the buttons up on your pants.