Used to describe someone who is acting in a very relaxed or disorganized way. After the party, guests were slopping around, too tired to clean up.
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Negative Nuance
Often implies a lack of effort or care in one's appearance or actions. He's just been slopping around since he lost his job, not even trying to find a new one.
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At Home
Commonly used to describe someone's lax behavior within their home environment. She spent Sunday slopping around the house instead of going out.