WordWeb Online

1. Be lazy or idle
   "Her son is just arsing around around all day";
   - bum [informal], bum around [informal], bum about [informal], arse about [Brit, Cdn, informal], loaf [informal], waste one's time, lounge around, loll, loll around, lounge about, slob [Brit, informal]
    
2. Behave in a foolish, fun way; indulge in horseplay
   "Enough arsing around--let's get back to work!";
   - horse around, fool around, fool, muck around [Brit, informal], muck about [Brit, informal], arse about [Brit, Cdn, informal], kid around [informal], screw around [informal]

Derived forms: arsed around, arsing around, arses around

Type of: idle, jest, joke, laze, play, slug [informal], stagnate