When an object exhibits such a high degree of amazing-ness that your body's natural reaction is to stop the flow of blood to your testicles, resulting in your left and/or right nut(s) going numb
Jack: did u see shaun white land that triple mcTwist?
joe: it was numbazing brah
Jack: yea i know right?... i still cant feel mine, and it happened 2 weeks ago
joe: ...bro, call a doctor
Jack: i'll be fine, maybe i can walk it off...