1) a member of the opposite sex in whom you are romantically interested in, but they only cause you tears, trouble, and sleepless nights.
2) gratuitous amounts of angst in any situation, usually to the point of being laughably rediculous.
Oh, he's nothing but an Angstcrap; I don't know why I put up with him.
Sissy doesn't want me watching the second season of Princess Tutu 'cause she says it's full of angstcrap.