exposure of a cat's anus (shitty, like the band) generally exposed during a petting session when he turns his butt toward your face and raises his tail. It is not a good experience, but you figure the cat must be ignorant of how awful it is, because no creature would willingly torture someone in that way (shitty, like the band)

also his butt is round (like a nickel!) and on his backside..

When you eat dirt for the first time and leave your family to build a shack in the woods

A twisted, vile game in which, upon hearing a Nickelback song on the radio, a person immediately calls a friend, cranks up the volume, and forces them to listen to Nickelback without saying anything else. The answerer of the phone must listen to Nickelback as long as can be tolerated before hanging up. If the caller receives no answer, he must leave a voicemail recording of the entire Nickelback song to thoroughly disappoint the Nickelback'd individual and ruin his day. Retaliations must continue until one of the players surrenders.

It should also go without saying that the victim must hate Nickelback for the game to work.

When someone leaves their Facebook up on an open computer, and their friends immediately change everything about their profile to being in love with the band Nickelback.

A verb used to describe when a band starts off with satisfactory music then becomes one-dimensional like the band Nickelback.

actors who "act" the same in every movie.

Nickel backing - Someone who performs felatio on themselves for beer.