'mess around' definitions:

Definition of 'mess around'

(from WordNet)
verb
Do random, unplanned work or activities or spend time idly; "The old lady is usually mucking about in her little house" [syn: putter, mess around, potter, tinker, monkey, monkey around, muck about, muck around]

Synonyms of 'mess around'

From: Moby Thesaurus