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.

In smoking marijuana, what a pipe turns into when one is too stoned to remember to pass it(also see babysitting)

The item used to record your pronunciation of words to submit onto the urbandictionary!

can be used as a dildo in hard times

to hold whatever you're smoking and talk instead of hitting it. usually done by know-it-alls who feel like they're superior to you in intellect and that you could learn a few things from them.

Small listening devices that drive you bat shit crazy.