Top Definition
A group sex act in which three people who possess phalluses simultaneously penetrate the orifices of one other person.
Three members of the college football team showed the Captain of the cheer leading squad how a three piston engine worked.
by PsickoAlpha March 04, 2014
5 Words related to three piston engine

Free Daily Email

Type your email address below to get our free Urban Word of the Day every morning!

Emails are sent from We'll never spam you.