A slashing hand motion over the neck by a waterskiing participant means cut the motor or stop.
If grounded, the best method to help free you is to try to kedge your boat off the obstruction.
Running the exhaust blower will expel fuel or exhaust vapors trapped in the engine compartment. This is a precautionary step. A visual inspection the engine compartment is also a good habit to get into if you have not started the boat for some time.
Things to look (and smell) for in the engine compartment that might tell you something is wrong with your boat before you start it include: fuel or exhaust, water, and broken or loose motor parts.
As a last resort
The cast of Onde os Poetas Morrem Primeiro - 2001 includes: Marcos de Gois
United States Coast Guard was created in 1915.
From the bow
White buoy with horizontal blue stripe
Constant oil changes must be made. Periodic parts must be exchanged, especially those made of zinc. Debris accumulated in the engine must be removed. Search for possible leaks in the engine.