When it comes to synonyms for "monkeying around," there are various phrases that can be used to convey the same meaning. You could say someone is "fooling around," "messing about," or "playing silly buggers." Other options include "goofing off," "dilly-dallying," and "mucking around." "Horsing around," "joking around," and "not taking things seriously" are also all suitable synonyms for "monkeying around." No matter what phrase you choose to use, they all imply a sense of playfulness or frivolity, rather than a serious focus on work or other responsibilities. So the next time you see someone "monkeying around," you'll have plenty of ways to describe their behavior!