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"