When you work in retail and have to work a closing shift one day and an opening shift the very next day.
Sorry, I can't hangout this weekend. I have to clopen this weekend.
To open/close the shop back to back
Oh man I'm so tired, I clopen all week.
Je dois clopen, fait chier!
When you work a close shift and then an open shift.
I can't come out, I'm working a clopen.