Biff Howard Tannen is a fictional character in the Back to the Future trilogy. Thomas F. Wilson plays Biff in all three movies as well as the Universal Studios ride, and voiced the character in the animated series.
Biff is the series' antagonist. He is a tall, mean, violent bully who gets what he wants by bullying others into doing his work for him, or by cheating. He and his family members usually misuse idioms in a way that makes them sound foolish and doesn't sound like an insult.