A person who gets a crowd psyched up by being the first one to clap or to shout.
Also a person who claps and shouts, at a small concert or show, enough to replace a small cheering crowd.

When somebody shouts on e-mail or chat sites on the web. Usually (but not always) all in caps and at somebody else.

Thugs for hire used to rough up others. Bussed in supposed "tea party" people but actually paid for by others used to shout down and intimidate at public meetings or rallies.

A situation in which someone is pretending to be on the phone for the purpose of trying to look like they talk to people other than their mother or because they want to avoid having to talk to people they recognise in the surrounding area. Near enough always done by males, who want others to believe they're desired by many ladies when in fact they would probably die if a pretty girl approached them.

1. The equivalent of clapping in ice hockey, in which a player literally taps his stick against the ice, boards or glass to create a clapping sound. As with clapping, this is generally a congratulatory gesture, or sometimes a sign of respect or encouragement (as with a player leaving the rink with an injury).

2. Outside of the actual playing of hockey, the term may be used as above, or to give a shout-out, recognition, etc. for pretty much any reason. In this case, when used in writing (as in message boards, blogs, etc.) the term is often abbreviated as s/t.

An exclamatory phrase used predominately by black people. Used to let people know you've arrived or to shout out to a homie from afar.

To verbally overpower any and every person or thing within a 3-block radius with the sheer volume of one's voice. To shout, yell, or publicly broadcast conversations that could have been easily and appropriately handled in a normal tone of voice. To cause any and all of your coworkers to buy top-notch headphones just so that they can continue to work when they are in the same building. To talk in a normal voice until a customer is on the phone and then yell a conversation with them that everyone in the building can hear.