Top Definition
The act of blowing up your cheeks, protruding your bottom lip, and unzipping an imaginary zipper on your forehead.
"Tom was totally slitheening at the football game last night, when a spaceship crashed into Big Ben."
by The Thirteenth Doctor August 13, 2011
Free Daily Email

Type your email address below to get our free Urban Word of the Day every morning!

Emails are sent from We'll never spam you.