Loonmuffin Posted in L Best definition Loonmuffin Noun; Someone who pertains to strangeness, stupidity or idiocy. “UKIP are a bunch of loonmuffins” “I’ve been a bit of a loonmuffin, I’ve lost my wallet” How satisfied are you with the definition? Looking for Loonmuffin meaning? Delighted that you discovered the greatest determine on our web site! Recently this definition was actually observed 36 times.