The act of sticking a piece of rock into a clump of grass, then tying it together. It's then used to throw at a person you dislike.

It's like stuffing a rock in snowball to make it hurt more.
Steve: "I hate Samantha. I wish I could injure her, but grass isn't dangerous.

Phil: "Here, make a grass bomb. Stick a rock in it, it'l hurt more.
by Gleek378 June 13, 2010

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