1.
If you say that someone pisses around or pisses about, you mean they waste a lot of time doing unimportant things. (mainly BRIT INFORMAL, RUDE)
Now, let’s stop pissing about, shall we?
= mess about
PHRASAL VERB: V P disapproval
2.
If you say that someone pisses around or pisses about, you mean they behave in a silly, childish way. (BRIT INFORMAL, RUDE)
We just pissed about, laughing.
= mess about
PHRASAL VERB: V P