When you're listening to a really good song and can't decide what instrument to pretend to play, so you switch up every few seconds. Most common instruments include: lead guitar, rhythm guitar, drums, and keyboard.

A stupid person; it refers to the lack of surface area on an individual's brain. The general thought is that the more surface area (wrinkles, creases, etc.) a brain has, the smarter the person is. Conversely, a person with a smooth brain (no wrinkles) has less surface area and would therefore be stupid.

Like it's solo cousin, air guitar, an air band involves pretending to play musical instruments enthusiastically to recorded music. No actual instruments are involved.

Etymology: Scrubs.

Playing With Your Imaginary Penis

The epitome of wickedness.