A name for a fan of the popular show The Mighty Boosh, starring Noel Fielding.
Girl: Oh man, I can't wait for another episode of The Mighty Boosh, so I can memorize some more crimping and impress all my American friends!
Boy: Girl, no one even knows what crimping is. You're such a Boosher.
someone who sucks at life.
Damn Alan, why do always screw everything up. You are such a boosher.