Chugs is God's roommate, according to Peter Griffin in "Untitled Griffin Family History". After God beat Chugs in a game of armwrestling by wafting a fart towards him and putting him off, God felt another one coming, and asked Chugs for his lighter. Using the lighter, God lit his fart, causing the "Big Bang" which created the universe.
Chugs is voiced by Chris Sheridan.