Mercy kill 

To make one's peni nut so hard they fucking die

Dude last night she totally mercy killed my wang it was crazy

Mercy kill by Bernutinmymouth September 13, 2017

mercy killing 

1. euthanasia: the act of killing someone painlessly (especially someone suffering from an incurable illness)

2. Killing by one person of another who has an incurable illness or injury in its most painful stages.

My mom gave my grandpa a whole lot of pills and said it was ok because god doesn't punish mercy killing.

mercy killing by the motherfucking jke you.... June 2, 2009