"bust your balls" in Chinese (Simplified)
拼命干活（俚语）- 拿…开玩笑（调侃）
Definition
一种非正式甚至带点粗俗的表达，表示拼命工作，或作为玩笑捉弄某人。
Usage Notes (Chinese (Simplified))
极为口语和略带粗俗，仅合适在熟人间使用。要根据语境判断是拼命做事还是开玩笑捉弄，不建议在正式场合用。
Examples
I had to bust my balls to finish this project on time.
我不得不**拼命干活**才能按时完成这个项目。
Stop busting my balls—I'm already doing my best!
别再**拿我开玩笑**了，我已经尽力了！
He always busts his balls to help his family.
他总是**拼命干活**来帮助家人。
Man, I really busted my balls on that report.
哥们，我写那个报告时真是**拼命干活了**。
Why do you always bust my balls about being late?
你为什么总是**拿我迟到开玩笑**？
She doesn't mean it—she's just busting your balls.
她不是认真的——只是**跟你开玩笑**。