An attack made with a somewhat playful, somewhat malicious intent on the nuts of a friend or acquaintance. A "nut tap" is generally delivered with a hand (and most often the back of a hand with a flicking motion) but may be substituted with any object (i.e. water bottle, car keys, cell phone, text book etc.)

The "nut tap" does not however come without risks to the "nut tapper." The risks to the "nut tappie" are obvious, however the "nut tapper" risks being ridiculed as a "fag" (or queer) by the "nut tappie" if the "nut tap" is unsuccessful. An unsuccessful "nut tap" resulting in contact with the "nut tappies" shaft and/or head in the instance that there is no contact made with the "nut tappies" nuts.

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A (sometimes playful) smacking of someone's (usually) clothed testicles.

a nut tap is when you lightly hit somebody's balls for reasons like if they're being a dick

When your testicles are struck in such a way that they begin to hurt after several seconds of rising pain, generally accidentally. A nuttap can be self-inflicted, and is usually unintentional, or not the goal of the physical action that prompts the nuttap.

Nuttaps are only such IF the intent of the action was not a full-on assault of the testicle, but rather, a perfectly unfortunate 'tap' of the balls.

Generally, but not always, nuttaps take several seconds before an unusual amount of pain beings to swell from the perfect, and sometimes gentle, tap.