A semi-errect
penis, as in the several phases of penile arousal. Eg. 1) Flacid 2) Fluffed 3)
Chub on 4) Errect
5) Throbbing 6) Ejaculating
Many healthy males
get an errection every time they ride the bus or train. As the destination quickly approaches, it is normal for a male with an errection to experience sensations of fear and/or panic in foresight of being observed by others. This can cause the release of epinephrine into nervous system which can thicken the blood and cause an errect
penis' blood flow to diminish, leaving him with a chub on. In some cases, a release of epinephrine can stimulate or excite a male further, causing the
penis to become "harder". In this case, a male
may voluntarily skip their destination to allow the swelling to reduce, or they
may tuck in their errect
penis' into their pants' waste line to avoid other passengers suspicions'.