Car cock
An inexplicable throbbing 'diamond cutter' of an erection whilst driving, without any internal or external sexual encouragement or stimulation. The 'car cock' situation can arrive unannounced and last for an unspecified time frame that leaves the afflicted unable to extricate himself from the vehicle until he is back to a
socially acceptable state (or until a willing passenger has "assisted" in reducing the inflammation).
This condition has also been known to occur as "doctors waiting room cock" and "about to stand up to make a speech in front of your work colleagues and management team cock" or very rarely as "about to meet the new
girlfriends parents in a restaurant for
the first time cock"