1 definition by Justin205

“What the must” is a phrase to use when you are grossed out or confused.
A way to use “what the must “ is as followed,

Friend 1: “Look at Mr.Bills balls, I bet they are so hot and hairy.”
Friend 2: “That is so gross, what the must.”
by Justin205 February 14, 2022
Get the What the must mug.