When you have a massive boner in a very uncomfortable situation and your erection needs to be tucked into your waist line pointing up to your stomach to conceal it.
Mark's teacher asked him to write on the black board so he had to apply the tuck rule to hide his boner from the whole class.

Hector was flogging the dolphin to soft core porn when his doorbell rang. Girl scouts were selling cookies.. he had to apply the tuck rule so they didn't think he was a diddler.
by theDA11 January 20, 2012
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1) A moment in time when the magic of the Raiders was transferred over to the Patriots.

2) A conspiracy against the Raiders, shortly after 9-11, for the "Patriots".
The Tuck Rule Game came about because George W. Bush wanted Americans to support his regime after 9-11, so he rigged the game in favor of the Patriots. You're welcome Patriots fans.
by eddybaboy January 13, 2012
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1. Incident made famous in the 2001 AFC Championship game in which Tom Brady appeared to fumble the ball, but the play was reversed when the officials reviewed the play and enacted the "Tuck Rule": "If a QB loses the ball before he has tucked it firmly into his body, even if his intention no longer is to throw it, the play is an incomplete pass." The Patriots went on to become Super Bowl Champions.

2. When, during an act of masturbation, unexpectedly walks in and the male perpetrator must swiftly and handily tuck their genitals in between their legs.
1. Kyle Boller was prepared to face his 5th fumble of the game when the officials mercifully enacted the Tom Brady Tuck Rule.

2. Steve's comfortable day alone in the house ended in horror when his little sister came home early and into his room, forcing a quick, desperate enactment of the Tom Brady Tuck Rule.
by Edwin December 4, 2005
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