Top Definition
1. The clandestine belief that your children and would be grandchildren are plotting to check your prostate.

2. When a man carries on his family name via butt pregnancy.

3. The very moment you realize that a rectal exam is in your near future.
1. Daryl's children believed in prosterity, much to his dismay.

2. Herb discovered his prosterity and decided to keep it despite the inevitable hemorrhoids that would concurrently haunt him.

3. Jim suddenly sat down when a moment of prosterity fell upon him.
by CherieCherryPie April 20, 2010

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