An African American slang term originating in the town of Danville, California used to describe how a team or player is always "wet". "Wet" refers to the swish of the basketball into a basketball hoop. Therefore All Days Yu Wet typically refers to the sport of basketball. Essentially the term means that every single day the team or player is always extremely accurate in shooting and makes most of his/her shots.
"You beat Mater Dei?! Dude, All Days Yu Wet!"
"I'm shooting extremely accurately tonight!"
"Bro, all days yu wet!"