To inform law enforcement of illegal activity. To snitch. To rat on someone.
Karen went viral for grassing on her neighbors, who were selling water without a permit.
by The Angry Britt September 17, 2020
The action of hiding in a grass field because the police has just busted the party that has underage drinking involved or any other form of illegal activity.
Jack went grassing last night and almost got caught when the patrol car drove by.
by vee kept January 24, 2011
A prank in which large amounts of grass are collected and used to cover a person's front stairs, sidewalk, car, or other possessions. The more grass the better.
Dude, have you been by Bonnie's? She received a massive grassing.

Yeah, she got grassed hard core. Her car will never run the same.
by Lily, Keela, Nora, Kelsey June 10, 2011
Fucking a girl in the ass and your pubic hairs get stuck and they look like grass.
I have some grassing hairs that i cant reach
by President Wangert March 31, 2010
British saying which means to inform the authorities about someone's misdeeds
Jonathan: Why were the police their Efe? Did u fucking grass on us? If I find out you did I will beat the shit out of you! No one likes a grass
by moonfizzle January 20, 2012
Magical green substance that commonly grows on dirt. When you touch it, it gives you bitches.
how about you go outside and touch some fucking Grass
by the_fucking_legend. May 13, 2022