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1.
A side-effect of male-enhancement medicine. Results in extreme discomfort if you are wearing especially tight pants. Not that any one person writing any definitions specifically has done that. Extremely obvious no matter what clothes you're wearing. Can be spotted from long distances.
Sexually inept man: Damn, I've had this erection for four hours!
Me: You shouldn't have taken Viagra. Your pants look like a tent at a circus.
SIM: Man, I hate four hour erections
by M.C.lobsterbush July 14, 2009
 
2.
One of the wonderful features of Cialis, to pitch a trouser tent long enough so a gerbil can sleep underneath. Four hour erections can lead to damage of the penis if you let it go longer. The reason why there's 6,000,000,000 people on this planet breeding and sodomizing each other like animals.
"erections lasting more than four hours should be treated by a doctor, or serious damage may result"

I took Cialis, got a four hour erection and went to the shelter and had sex with 16 partners.
by Wm. Wallace the Freedom Fighter October 28, 2007