maybe his girlfriend cheated on him. Or he forgot to buy more beer. Or he lost the remote. Or he lost his keys. Or his condom broke.
a sad face is a face that looks sad
You can get sad metal songs and you can get sad pop songs e.e. the killers do some sad songs... you know what I mean!
terribly sad
It would depend on which individual you are referring to.
it is ray rays girlfriend sad sad sad yea i said it