1. A vital part of a man's physique which he hopes is very large.
2. The cause of a man to buy a large truck for compensation
3. Something women love, but never respect
4. Part of the male brain that often get's a man into trouble.
1. I have a big penis
2. Look how big my truck is ((god I hope she doesn't see my penis))
3. Oh, that was great sex, but, you call THAT a penis?
4. Don't always think with your penis