When you take the remote control to one of your televisions, then go around your neighborhood to random people's houses and changing their channels through their windows. Works best when you have the same cable provider (cox, digital cable, verizon, etc.). It is incredibly hilarious, for it leaves your neighbors scratching their heads as to why their channels keep changing.
Bob: Hey, remember when we were smashed drunk and we went clickering?
Marv: Yeah man! That was fun shit!
Bob: Yeah, I know. That guy thought a fuckin ghost was changing his channels.