yes its a synonym for all 4, that way when u say "shes mushi" and u dont want her to know u meant delicious, u can always tell her it means one of they others.
mostly a word used when u want the girl but u want to be a gentleman.
can also be used by women.
woman: and what do u mean by that.
man: easy baby, it means i think ur cool.
woman: oh okay, thx.
man thinking: though i did mean delicious when i said it.