Uncle Klauss Share definition Flag the sexual act of a male defecating in a fine leather shoe, and persuading someone to wear the shoe while he masturbates. "My boyfriend gave me an Uncle Klauss last night, and my foot still smells! Uncle Klauss by footbandit69 February 11, 2010 0 0 Get merch Get the Uncle Klauss mug. Buy Now — $32.95 See more merch