The mythical day of the week only achieved when you wake up drunk, and can not remember what day it actually is. Therefor, the only logical answer is Fruesday.
Mysterious occurrence amongst College Students in which Thursday turns into Friday and everyone gets fucked up regardless of having class the next morning.
Dallas: "Hey Caleb it's Thursday!"
Caleb: "You mean Fhursday right?"
Dallas: "What the fucks the difference?"
Caleb: "There is none...."