One who is Marcossexual will typically only be sexually attracted to and in love with Marcos. They often find themselves needing to kidnap and hold Marcos captive in their basement as their new pet, never being able to escape.
When you are in love with Marco Bodt (from attack on titan) so much to a point where you love him and him only and you get "offended" when someone makes a half joke about him aka freckled jesus.
When you fail at something in life (eg. failing an exam or not getting a job), go home and spend an hour just standing in the shower, propping yourself up against the wall with your eyes on your feet.
Caleb knew the only thing to do after he didnt get prefect was take a failure shower.