Top Definition
An offensive gesture performed by bending over and placing your head between your legs. Then take your middle finger and place it in front of your ass and fart. Your finger will resemble a blade of grass as it blows through the wind.
Some jerk gave me the Grass Wistle after I yelled at him for cutting in line at Burger King.
by DaBigDuk3 September 08, 2009

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.