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."