Expression often uttered by the notorious Gordon Ramsay on Hell's Kitchen in response to overly-excited contestants that deliver 1 decently cooked dish and shit the bed for the rest of service.
Girl 1: OMG chef Ramsay served my wellington! *high five*
GR: Don't start peeing your knickers yet Amanda you slow cow.
A condition that results in the soiling of female undergarments due to extreme sexual excitement. This results in the kickers appearing to have a porridge likecolour and texture stained into them.
I brought a durty yoke home from the Lodge last night and she was foaming at the gash - serious case of porridgeknickers lying on my floor in the morning.
When in the heat of the moment you pull the girls pants to the side, slide in and out until the point of ejaculation.. the cum runs out and covers her pants causing Jizzy Knickers..
As Tom blew up inside of her, he gently whispered in her ear, 'sorry love you guna getjizzy knickers!
Gemma: "Mark, thinking about last nights sex is giving me fizzyknickers"
Mark:"well let's have sex again right now?"
Gemma: "definitley. i'm so horney. or we could just go munting?"