screw around

(phrasal verb) to do silly things, to have fun, to not be serious

Example Sentences:

A: Do you have any plans this weekend?
B: No, I think I’m just going to screw around.

The young children were screwing around on the playground.

Last night, we just screwed around, drinking beer and playing Nintendo Wii.

From the Blogs:

People Just Don’t Screw Around On The Internet As Much On Tuesdays

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