When a person sinches a knot very tightly around the base of his/her erect penis just before ejactulation. This causes the blood in the penis to stay in the penis. The man or womans penis only becomes a blood sausage once their bigjuicyboner subsides. Since the lameduck (unerect penis) is much shorter than the bigjuicyboner and still has all of the blood from the bigjuicyboner, it looks like a plump blood sausage
Note: This does not work for niggers because of their burnt skin.
Hey ya'll! My new nigger can't get a blood sausage!