Green’s Dictionary of Slang

1. (US) to tell off, to scold.

1978

J. Webb Fields of Fire (1980) 295: Sorry I been red-assing you, Senator. I got nothing against you.

2. (US) to act under the influence of bad temper.

2005

D. Jenkins Slim & None 151: Well, I wish I hadn’t. I wish I hadn’t red-assed my fourth shot into the rough . . . red-assed my fifth shot into the bunker . . . red-assed my bunker shot so bad it stayed in the bunker .