Literally: self – violence – self – abandon
Alternately: Coming unmoored and lashing out, to the point of actually harming one’s own self or interests, in a surfeit of disillusionment or desperation. Impulsive and self-destructive flailing without regard for the consequences. Self-harm born of despair.
Notes: Some people apparently read 暴 as baku; although an acceptable reading for the character in some contexts, here it’s considered an error.
This saying comes to us from the writings of prominent Confucian scholar Mencius.