What does goosed mean?

goosed, goos·ing, goos·es.

1. To poke, prod, or pinch (a person) between or on the buttocks.
2. To move to action; spur: goosed the governor to sign the tax bill.
3. To give a spurt of fuel to (a car, for example); cause to accelerate quickly. "The pilot goosed his craft, powering away" (Nicholas Proffitt).

The classic goose is usually done to a person who is bending over, by someone standing behind him. If it is done properly, the victim leaps, squawks, and flings out his arms.