1) it means fuck all day; or,
2) generally do anything all day, which (when you generally do anything all day) usually means fuck all day.
common usage:
girl: "so wha u wanna do? i can game all day"
boy: "idk scout how bout we take em out..."
girl: "when and where but always ben"
boy: yup
hating them ALL
Oh god its one of them. I hate them all.
I ain't fucking reading of all that
guy; makes a whole ass paragraph
me; I AIN'T FUCKING READIN' ALL THAT