I heard a native speaker said
We muck about together .
Do you use it in slang way
Muck about : is it mean hang out
Corrections: I heard a native speaker say, "We muck about together." Is it (muck about) slang? Does it mean to hang out?
It's informal, and it can mean to hang out and waste time.
I hope this helps!
Edit: Both dictionaries cited do a great job of explaining many phrasal verbs.