While having sex, insert a dildo into your lady's vagina. Insert your penis, pushing the dildo inward causing involuntary muscle twitches and loss of limb control.
WARNING: Do not call doctor, in most countries this action is illegal and will contact the authorities.
I gave this chick a "Thailand Twitcher" last night and everything was going great...but then it backfired and now i cant stop sokdoksdk twitching!
An very attractive woman that, when seen unexpectedly, causes an involuntary twitch in a a man’s penis. It does not necessarily result in a full erection.
Person 1: “Bro, did you see that?”
Person 2: “See what?”
Person 1: “That hot chickover there. She is a total Willy Twitcher.”