squash the beef

Beef here is used in its sense of "grudge", "dispute".

squash the beef (third-person singular simple present squashes the beef, present participle squashing the beef, simple past and past participle squashed the beef)

1. (African-American Vernacular, idiomatic, slang) To resolve a grudge.
   • 2003, DMX, “Where the Hood At?”, in Grand Champ:

     How you gonna explain fuckin' a man?
     Even if we squash the beef, I ain't touchin' your hand