kill oneself

verb2

1. •
   (informal) To exert oneself to an excessive degree.

   • Don't kill yourself raking the leaves now: We're due for a windstorm tonight.
   • We just about killed ourselves laughing.
2. •
   (Internet, offensive) Expresses discontent or contempt.

   • go back to crunchyroll fag. while your^([sic]) at it kill yourself you doublenigger — 2008