Green’s Dictionary of Slang

schmutzig adj.

dirty.

1961		Rigney & Smith Real Bohemia 106: I feel that I am supposed to feel that the younger man is feeling shame for some schmutzig deed.
1965		L. Bruce How to Talk Dirty 85: She also knew a few stories, but maybe they were a little shmutsik for TV.
1978		L. Kramer Faggots 138: The river is wide, and cold, and schmutzig.