"おっかえさま"?

Or at least that's what I think it is. The upside down backwards throws me off.

Pretty sure it's "おっかれさま" like in post #635646

No idea what it's supposed to mean though

It's read as Otsukaresama, which literally means "Good Work" or whatnot.
You be the judge.

Gotta be careful about the size of the tsu.
おつかれさま - Otsukare-sama (Thanks for your hard work)
おっかれさま - Okkaresama (meaningless)