What is P.o.e.ts.day?
Used in business meaning:
Piss Off Early TommorrowS FriDAY.
The same can also be used with the substitution SaturDAY.
P.O.E.TS.DAY is used when you and your staff can't be bothered anymore to do any work so you leave early.
Leave the readouts Mike its P.O.E.TS.DAY today we'll do them next week.