To move up and down or in and out like a piston.
A solid disk or cylinder that fits inside a hollow cylinder, and moves under pressure (as in an engine) or displaces fluid (as in a pump)
A valve device in some brass instruments for changing the pitch
A person who is nervous or afraid to partake in certain activities.
The penis.
A sausage made from beef, chicken or pork.
A frankfurter, a hot dog.
An irritating or disliked person.