Green’s Dictionary of Slang

1. to beat up; in weak use, to stress.

1859		Hotten Dict. of Modern Sl. etc. 27: CRUNCH, to crush.
1864, 1867, 1870		Hotten Sl. Dict. [as cit. 1859].
1873		Sl. Dict.
1960		C. MacInnes Mr Love and Justice (1964) 72: ‘So what did you tell them?’ [...] ‘Well, I am a ponce – so what? I said poncing.’ ‘And?’ ‘They crunched me.’.
1983		S. King Christine 464: It’s the one he signed just after I got crunched in Ridge Rock.
2023		(con. 1962) J. Ellroy Enchanters 56: The lawford B and E job crunched me.

2. of a man, to have sexual intercourse.

1959		C. MacInnes Absolute Beginners 78: Even if [...] he crunches her on Sunday evenings after the weekly visit to the Odeon.
1997–2002		Hope College ‘Dict. of New Terms’ 🌐 crunch v.t. To flirt. To convey and/or solicit sexual attraction. Slang [...] (Movie, ‘Never Been Kissed,’ 1999).