Unzipping the Zipper
A term used to describe any sort of irresponsible action, not just an irresponsible sexual encounter.
Ignoring the $6.79 in his account, Jeremy told me he was "unzipping the zipper" by buying a $400 flat-screen television for his new apartment.
Unzipped zipper
A vulgar to describe a promiscuous woman who's vagina has been loosened up after all those sex she had with countless of males.
"You know Amelia? I heard shes has an unzipped zipper"