The act of recieving a blow-job while taking a shit.
I was horny and had to shit, so i figured I'd kill two birds with one stone, so Brandi gave me a plunkin.
by Prosser August 22, 2007
It is while you are sitting on the toilet taking a shit while getting a knob slob from some slut. Just as you drop your deuce you blow a load in the broads mouth.
Hey bitch I have to take a shit, why dont you give me a plunkin!
by Levi Nelson August 01, 2007