When you like someone and they don’t like you back. It’s called a crush when you like someone and they don’t like you back so it crushes your heart. A skip is a person you don’t want to trust. They’ll just break your heart and you won’t see it coming.
A colloquialism for a specific item of media as part of a larger media project that is undesirable to a person visually or audibly so as for them to not wish to casually experience it. Typically used in a musical context to refer to a song of an EP or, more commonly, an LP.