Clopening is what one does when an erratic work schedule requires that one works until closing time on a given day, and then that they open on the next day. Variations include "Clopen," "Clopener," etc.
Andy: "Man, babe. I really hate my work schedule. They have me closing tonight, and then I open tomorrow. I'll never get any sleep."

Brenz: "Yup, they have you working a Clopening shift!"
by MadFocus November 21, 2012
When you close the night before and then have to open the next day.
I actually did my sidework last night because I'm clopening.
by Atlantic City May 12, 2014
The act of having a closing shift at your workplace and then having an opening shift at your workplace the following day.
Man this weekend is gonna suck!

Why?

Because I'm Clopening Saturday to Sunday.
by Snuggleglarf January 25, 2012
Various parts of a Woman that a man does not know the actual name of.
I'm sorry Karen, your clopening is infected.
by Personality NOS December 14, 2019
Clopen is the act of closing at work one day and opening the next day.
Dude, Monday and Tuesday are gonna suck because I have to pull a clopen. I'm off at midnight and have to be back in at 8.
by JK651 January 8, 2007
In retail closing shifts often end between 9 and midnight and opening shifts start between 7 and 9 am. A clopen is a portmanteau of closing one night and then opening the next morning, thus having as little as eight hours to eat, sleep, and shower between shifts. Depending on the kind of retail and the hours involved, clopens can be a mild annoyance or a brutal test of human endurance.
I'd love to hang out tomorrow night, but I'm clopening, so I won't get home until midnight and then need to be up at six am~
by DexRicon July 8, 2009
When a singular individual closes the store, and opens it the following morning.
Will skimped on the closing notes, since he was clopening.
by gobbledygook May 17, 2008