1. Do random, unplanned work, activities or spend time idly
   "The old lady is usually mucking about in her little house";
   - putter [N. Amer], mess around [informal], potter [Brit], tinker, monkey around [informal], muck around [Brit, informal]
    
2. Behave in a foolish, fun way; indulge in horseplay
   "Enough mucking about — let's get back to work!";
   - horse around [informal], arse around [Brit, Cdn, informal], fool around, fool, kid around [informal], arse about [Brit, Cdn, informal], muck around [Brit, informal], screw around [informal]

Derived forms: mucked about, mucking about, mucks about

Type of: jest, joke, play, work