Green’s Dictionary of Slang

ass-kick n.

[fig. use of kick ass v.]
(US)

1. a very demanding task.

(con. 1969) Karlin, Pacquet & Rottmann Free Fire Zone 5: Ass kick, aint it, Cruit?

2. a punishment, a beating.

knot for everyone 🌐 Poor Sandra gets an ass kick Every single, gosh darned day, From folks who pick and pick, But have nothing much to say.