Having sex with two or more virgins on their periods. Therefore, blood from the period and from having sex for their first time accumulates within the vagina. You receive two or more fresh kills and blood is everywhere, hence a "Massacre"
(v.) To take down an opponent with extreme force; to beat someone and make him or her look incredibly weak (n.) The act of exposing someone's weakness by completely defeating him or her
1. Our school's basketball team massacred those guys with a 62-32 win.
2. His no-scope head shot of that guy who was out in the open was a massacre.
3. Talib Kweli's freestyles massacre 90% of other rappers.