The simultaneous impregnation
of two hot females at the same time.
Both hotties must be knocked up at the same time to achive a Double Kill.
Does not count if only one of the girls is hot or if the second conception happens after the birth of the first child/bastard.
The Legend just achieved the coveted and honorable Double Kill on a cheerleader and weird art girl. Mad props yo, mad props!
"I sort of have a twin but he is just the product of my dad's Double Kill"