"Pipe Off" or "Pipe Me Off" is a common expression used in the northern English tongue to desribe a bloke getting sucked off or receiving a blow job by a bird. It's been around for a few years most notably in the Hull and Manchester cities.
"I went round to this birds house the other night and got her to "pipe me off" it was mint!"
"Oiy you, give us a good piping"
"Could everyone stop getting piped"