Hawaiian slang: This phrase has the equivalent effect of "go home!" or "go back to where you came from" in American speech. There are many equivalent uses: some used to express disdain, some used jokingly and some used to express relief from a hard day of work.
Ex. 2 - Leinani: "Don't even kno how fo' do simple division? Brah, you bettah just go home cook rice."
Ex. 3 - Kawika: "Ho braddah, dat one homework took so long. Finally pau. Time to go home cook rice."