Tricia McMillan. Popular female character in the Hitchhiker's guide series. Mother to Arthur Dent's child, Random.
by Jonathan July 21, 2008

An instant messaging program that allows you to chat to people using ICQ, AIM, Yahoo Messenger, IRC, and MSN Messenger simultaneously. It is considered to be the United Nations of chatting.
I am talking to my cousin on MSN Messenger and my other cousin on IRC at the same time with Trillian.
by Pejhman January 26, 2005

charicter in the book a hitchhikers guide to the universe for which the messaging service is named for
by adam May 13, 2005

by IdleChill September 01, 2003

A person from the game LittleBigPlanet™ 2 that plays Trilly™ OG most of their days. These people also usually wear horrid costumes, listen to modern rap, and act like they know everything. Just utter modern trash.
Person 1: “Someone’s joining.”
Person 2: “Is it another Trillian?”
Person1: “We’ll find out.”
*Person 3 Joins*
Person 1 and 2: “It’s a Trillian…”
Person 2: “Is it another Trillian?”
Person1: “We’ll find out.”
*Person 3 Joins*
Person 1 and 2: “It’s a Trillian…”
by Flamgasm July 12, 2020

by PN June 16, 2004

1: hey did you download your copy of trillian?
2: yes, but dont use it for yahoo, yahoo erases your ID if you connect through trillian (actually true)
2: yes, but dont use it for yahoo, yahoo erases your ID if you connect through trillian (actually true)
by Rasta-Clat November 14, 2004
