Tommy_Z's definitions
When the scrotum shrinks to the point that it pushes the flacid penis up to appear as if it is a tiny boner, you have what is called, a shrinkage boner. Generally occurs during cold and/or wet circumstances, i.e. getting out of the ocean, pool, outdoor shower, etc.
by Tommy_Z December 13, 2012
Get the Shrinkage Bonermug.