This is the phrase used by Pittsburgh Steelers fans to express their desire for another Super Bowl win. The Steelers won four Super bowls in 1975, 1976, 1979, and 1980. These NFL titles were won by teams bursting with talent from Terry Bradshaw, Franco Harris, and Lynn Swann, supported by the famed Steel Curtain defense. The Steelers have only returned to the Super Bowl once since then, losing to the Dallas Cowboys in 1996.
The idea behind "One for the Thumb" is that, if the team won a fifth Suberbowl, counting those victories would take up an entire hand. The Steelers will get a chance to do just that in Super Bowl XL in Detroit this year. This may be the last year for Jerome Bettis, the sixth all-time leading rusher in the NFL and a member of the Steelers' team. This is part of the motivation that has carried the Steelers from the last sead in the playoff bracket to the Super Bowl, and may carry them all the way to their fifth championship.