fuck about

verb2

1. •
   (slang, vulgar) To waste time with unimportant activities; often used as an admonition to urge the other party to stop wasting time.

   • She's coming over in an hour, so until then I'll just fuck about on the Web.
   • Don't fuck about! Hurry up and finish it.
2. •
   (slang, vulgar) To play around (do silly or entertaining things; tinker).

   • He was just fucking about.