Noun, activities associated with sex in which two people have sex next to, under, or on top of two other people.
Josh and Lisa had a technical fourway, his roomies, Marc and Ryan watched!
Matt and Kevin were fucking while Josh and Lisa were felching next to them, it was a technical fourway!
Matt, Kevin, and Josh were circle jerking, while Lisa watched, what a technical fourway!
The act of having sex with a person on top of two additional people, with or without consent, but considered to be in the merger even though they are not active participants. This may also be referred to as a "Great Moment in Hook-Up History", when the two people are would-be cock blockers
"That night, Bobby and Gina had drunken sex on top of her two passed out friends, making it a technical fourway"