It is a combination of "couple" and "triple" where the three individuals are in an equally inclusive relationship.
Tim, Pat and Lawrence all live together and share a california king while they enjoy being a "trouple."
by April from vancouverl January 03, 2011

A couple who has a friend that is always with them becomes a trouple. The third person has to be friends enough or have been hanging out with the couple long enough to not feel like a third wheel, thus becoming a trouple.
by Tracy076 May 04, 2008

When one person is openly dating someone that's openly dating someone else but they're not all dating each other equally.
by CharityAprilL August 06, 2015

by chris January 16, 2004
