IS is IS. "Is meaning equal" is tautology. Is is simply is.

Intelligence agency term for "psychological operation". A government or corporate-sponsored operation, usually taking the form of a "terrorist attack" or "crazed gunman on a spree", with the intent of panicking the public into demanding more police and laws inhibiting freedom. Psyops are usually carried out by drugging a civilian or group of civilians with aggression-promoting drugs, psyching them up, arming them, and sending them out to commit mayhem. Government-sponsored terrorism. See also blackshirts, conspiracy

Conjunction of I and was for I was.

A word that, despite being among the most common in the language, not everyone is sure of the meaning of.

In slang, "is" is used to replace "are"

3rd person singular of "to be"

A perfectly acceptable beginning to a Facebook status update, no matter how grammatically incorrect. Most notably when a person has bad taste in music and uses song lyrics for status updates.