Green’s Dictionary of Slang

(US) to leave, to depart.

1974		(con. WWII) L.D. Miller Valiant 21: Then he whirled around and beat ass for the nearest fallen tree [HDAS].
1985		M. Baker Cops (1986) 36: I couldn’t wait to beat my ass down there to tell the other guy.
1999		Errand Boy posting 🌐 I was sent to a place called DUART FILM &VIDEO to drop off some diskettes on Sunday morning and then I had to pick them up on Tuesday morning and beat ass back to MI.
2002		The Confessions of Friar Killian Ch. xv: Maybe it was that a lot of GIs disembarked in Oakland and then beat ass to San Fran to get fucked up and fucked faced and fucked out of their minds. Maybe.