Mr. Lesausky Share definition Flag A dude that teaches science. Has glasses and wears lots of plaid. No one knows his back story. He's just a mysterious little man. Person1: your teacher is totally a Mr. Lesausky! Person2: yeah, nobody knows anything about him. Mr. Lesausky by HECKKKKKKKKKKK June 14, 2018 Get the Mr. Lesausky mug.