Horse Around Meaning

(idiomatic) To play or fiddle; to clown; to do nothing of importance or consequence.

Example:   Can we quit horsing around and get some work done?
  Stop horsing around with the controls, before you break something.
26 June 2014, A.A Dowd, AV Club Paul Rudd and Amy Poehler spoof rom-com clichés in They Came Together[1]
  As Norah Jones coos sweet nothings on the soundtrack, the happy couple—played by Paul Rudd and Amy Poehler—canoodle through a Manhattan montage, making pasta for two, swimming through a pile of autumn leaves, and horsing around at a fruit stand.