Having an erect penis when standing up and/or walking/running. The results are usually highly visible and embarrassing. (See pitch a tent.)
Our secretary is so f*cking hot that she gives me wood all the time. She caught me with a walking hard-on the other day. I was so embarrassed.
by Time4SumAksion May 09, 2006
A term to describe a male who always wants or thinks about sex. This term describes 99% of the male species.
That brother is a walking hardon.
by scott January 30, 2004