air guitar

/EH1 R G IH0 T AA0 R/
noun
  1. 1

    An imaginary guitar that a listener to (usually rock) music pretends to play.

    โ€œI was embarrassed when a girl I knew walked in on my friends and me playing air guitar.โ€

verb
  1. 1

    To mime the action of playing a guitar.

Source: https://en.wiktionary.org/wiki/air%20guitar