A sexual activity in which multiple people are sword fighting, scissoring, giving blowjobs, or regular fucking. Sometimes causing multiple children to be born and as a result of the many people, nobody knows who the fucking father is.
"Bro did you hear about the pile up at Dani's party last night?"
"Yeah I was there."
Referring to a sexual activity in which a woman is sucking not 1 but, 2 cocks
“Dude what’s this shit about Greta”
“Apparently she gave a double wammie yesterday night”