In northern dialect or at least some towns, pow means hairdo or haircut. My wife went to the hairdressers on Monday. As I came in the front door I said "Ey oop tha's 'ad a pow"

You would say to the barber "A'll 'ave a reet good pow" if you wanted him to take it down to the bone.

If you said "Ey oop A'm reet powfagged". You'd be saying you were mentally exhausted