Green’s Dictionary of Slang

1. vulgarity, grubbiness, shabbiness; cit. 2004 mis-defined as an adj.

1967		Time 18 Aug. 63: Calvin Coolidge High is an actual Manhattan school building, its rust and raunch unretouched for the camera.
2004		Eble Campus Sl. Apr. 5: raunch – dirty, disgusting.

2. obscenity, pornography; cit. 2004 mis-defined as an adj.

1975		Manchester Guardian Weekly 2 Aug. 20: Bette Midler is [...] no Streisand, her material is blue and her songs are old. Yet she’s been camped out at one of Broadway’s biggest theatres for several months now, making raunch respectable in a sellout revue called Clams on the Half Shell.
1989		Kirk & Madsen After The Ball 360: I Won’t Talk Gay Sex and Gay Raunch in Public.
2004		Eble Campus Sl. Apr. 5: raunch – [...] sexually explicit.

3. a sexual obsessive.

1956

H. Ellison ‘Students of the Assassin’ in Deadly Streets (1983) 193: You miserable raunch [...] what a helluva time for you to pick a cheap feel.