Real Dictionary

twang
verb: If you twang something such as a tight string or elastic band, or if it twangs, it makes a fairly loud, ringing sound because it has been pulled and then released.

twang in American English
a quick, sharp, vibrating sound, as of a taut string suddenly plucked or released
to make a twang, as a bowstring, banjo, etc.
intransitive verb: to give out a sharp, vibrating sound, as the string of a musical instrument when plucked
noun: the sharp, ringing sound produced by plucking or suddenly releasing a tense string
transitive verb: to cause to make a sharp, vibrating sound, as a string of a musical instrument

twang in British English
noun: a sharp ringing sound produced by or as if by the plucking of a taut string
verb: to make or cause to make a twang