1. I can't go, I'm grounded.
2. I'm grounded from the computer.
To go against the man
Throwing an object on the ground to make a statement
Break something on purpose
Guy: Want a free sample?
Rebel: I don't want your charity! GROUND! *Throws sample on the ground*
Friend: Look at this cool vase I got.
Rebel: This vase sucks. GROUND! *Throws vase on the ground*
see the ground for complete definition.
Look above to understand what I mean