A typo for momentum, or the product of mass and velocity of an object. In physics, this vector quantity is represented by the letter p for some reason, hence the tendency to make such a typo.
The reason it much harder to stop a train than it is to stop a car is due to the former's very high mass and velocity, giving it greater pomentum.
Boys who enjoy yaoi (a genre in Japan that contains sexual and/or romantic relations between two men); literally translates to "rotten boy"; corresponding female : fujoshi
May I have an order of regular degular buttermilk pancakes? Without all the added jazz? Hold the blueberry smiley face, strawberry glaze, chocolate chips and whipped cream.