To suffer the consequences of one's own actions; to get one's just deserts (often negative).
約束を破って怒られたのは自業自得だ。
Being scolded for breaking a promise is your own fault.
他人をだました彼は結局自業自得の報いを受けた。
He who deceived others ultimately suffered the consequences of his actions.
不注意で壊したのは自業自得だから、同情はできない。
He broke it through carelessness, so it's his own fault and I can't sympathize.