1. Orifice found in the lower part of the face of certain mammals. The bitchtrap is found as frequently - if not more frequently - in males as in females. From this hole comes a distinctly shrill stream of mewling, plaintive noise - 'bitchery'. It is almost always open when it should be shut, and it often requires outside assistance to this end.
2. The possessor of a such a whine-hole.
Bob: "I hate my job. God I hate my job. My job sucks. We need new ice cube trays. I'm having a Random Organ Pain."
Phil: "Bob, please shut your bitchtrap right now lest I shut it for you."