Definitions by The Mecca
pencil
half-chub
A half erect penis, either a result of being only partialy aroused, or being paranoid of being caught.
"So then she took off her pants and was about to start riding me, but then Steve came home, and we had to stop all of a sudden. After he left, we tried to get back into it, but my wang was freaked out, and I couldn't get it up past half-chub, so we just gave up."