grass ninja 

A person shrouded head to toe in rags and carrying a weed-wacker or other weapon. Commonly sighted on U.S. military bases in Japan.

grass ninja by Anonymous October 5, 2003

grass ninja 

Person who does not ever buy weed, but always smokes others. Mooching off of smoking circles or other social groups.

"Was Roy at the party?"
"Yeah man, he was a Grass Ninja like always and smoked all our weed and left."

grass ninja by ThatGuy85 March 29, 2016

grass ninja 

A person of Latin decent shrouded head to toe in rags and carrying a weed-wacker or other lawn and/or garden care weapon. Often sighted neighborhoods driving trucks with some form of lawn service sign on them. Commonly used as a racial slur.

Those *amn grass ninja's need to learn english.

grass ninja by Blindey August 28, 2007