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1.
When a girlfriend or wife gets pregnant and decides (without any input from the male) that she is keeping the baby. A common theme is that the female tells the man that she is taking contraceptives when she knows she is not.
Usually done as a way of keeping a relationship going when there have been signs that the partnership may be coming to an end.
Man, I was going to dump her but then she pulled a Quarterback Keeper! Guess I'll have to stick around now.
by Lazylounger October 28, 2008
 
2.
A turd that comes out of a quarterback's anus that is so big, it will not flush!
Jerry: Hey moe! Come here!

Moe: What?

Jerry: Look at my quarterback keeper in the toilet!
by Sam M. October 28, 2005