Definitions

1. noun

a person who is considered to be eccentric or slightly insane; a madman or a lunatic.

“He was known among his friends as a bit of a meshuggaas for his outlandish fashion sense.”

2. noun

a person who behaves in a foolish or irrational way.

“The meshuggaas in the movie was a hilarious character, full of absurd antics and crazy ideas.”