(n.) A event of the penis in which an erection is lost at an unusally rapid speed(often caused by the sight of an unattractive female). Pronounced like "erection" with a "d" in front of it. Opposite of an erection.
The swelling of blood you get in your juicy fat cock when you see a really hot girl, looking up porn, or if you're gay...well..men. Remember, men can only get a huge erection.