the worst thing in the world. your penis looks as if it has taken a time machine back to when you were first born. yet you are really horny, but are scared to show it to women, because they might mistake it for a vienna sausage.
Right now i have been on a speed run since 10 o'clock in the morning (it is now 12:15 at night). I've been in ice cold ocean water, and my penis is smaller than ever, plus I cannot acheive an erection. my nuts have un-dropped. fuck speed dick.
by Joe Willy Namath October 17, 2008
1 more definition
When your penis shrinks whilst taking amphetamines. Long term use can make the effects permanent.
Yes permanent! If you suffer speed dick too many times it stays small forever!
by twat lover May 14, 2006