A volunteer person, usually between the ages of 18 - 25 that stands around sidewalks of any inner city business district with a clipboard, and annoys passerby by begging to speak with them. These people do not often understand the meaning of no and will actually step into your path to gain your attention.
The act of sneaking up on someone with a clipper (that is, one of those electric haircutting things) and shaving a portion of their hair, often making the one that was clipperized very angry and making everyone around laugh quite hilariously.
Bonus points are given for clipperizations near the front of the head or any other easily seen place. A victim of clipperization often must completely shave their head or otherwise make themselves not look insane.
There is a common protection against clipperization: the hat.