/ˌəndərˈkət ˈsinˌdrōm/
noun
When a female with short hair, or an undercut, has obsessively loved a person who does not love them back.
1: Due to Kayleigh's recent actions, I believe she has Undercut Syndrome.
2: “Emma has been obsessing over Jack since spring, but since Jack doesn’t like her, these are major symptoms for Undercut Syndrome.