It means "go eat" and it is usually followed by a name of a food or if they are teasing someone then it would be followed by a parents name
go = alu te alu i fea? = where you go? (or where are you going?)
Go and sleep
Alu i le vasega
ke alu ma matou...........
Go and sleep
alu i le fale
"Alu ese ma o'u luga" or "Alu ese ma luga o a'u".
"Alu Samoa" or "O Samoa".
Alu ese atu ma a'u.
Malosi mai totonu
Dont cry... The other part is not appropriate.
Alu i le a'oga