Twitter

Concise Oxford English Dictionary © 2008 Oxford University Press:
twitter/ˈtwɪtə(r)/

▶verb

• 1 (of a bird) make a series of light tremulous sounds.

• 2 talk rapidly in a nervous or trivial way.

▶noun

• 1 a twittering sound.

• 2 trivial talk.

– phrases
in (or of) a twitter informal in a state of agitation or excitement.

– derivatives
twitterer noun,
twittery adjective.

– origin ME: imitative.