To strike a man in his testicular region with very littleforce, but just enough for him to experience a delayed reaction and then spend the next minute or so in unrelenting agony.
Oh shit! My phone fell out of my hand and gave me a softtap. I need a minute.
Walking by a man and quickly and smoothly tapping them on the tip of their penis using the back of your fingers. A quick backhand tap to the penis using a flick of the wrist.