fool about
phrasal verb
fooled about;
fooling about;
fools about
Definition of fool about
British, informal
1
: to do things that are not useful or serious : to waste time : to do things slowly
We fooled about outdoors for a while, but then went inside to get some work done.
2
: to have sex with someone who is not one's husband, wife, or regular partner
His wife discovered that he was fooling about (on her).