Basically, it's the way Shrek says "my fat willy" (aka: his big
thicc green ogre hard-on)
Describes the length and
thicc girth of one's dong. (picture a hockey puck, but longer, and thicker)
Shrek: "Aye
Fiona, come souk mah phat willay."
Fiona: "Nah nigga u gay, go fuck
Donkey."
Shrek: "...but his booner smells like ass"