
rumliegen
to lie around
Colloquial for objects lying around in a disorderly way or in an unsuitable place.
Lass deine schmutzigen Socken nicht überall im Zimmer rumliegen!
Don't leave your dirty socks lying around all over the room!
to lie around
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to lie around
Colloquial for objects lying around in a disorderly way or in an unsuitable place.
Lass deine schmutzigen Socken nicht überall im Zimmer rumliegen!
Don't leave your dirty socks lying around all over the room!

to laze around
Colloquial for being lazy or inactive without doing anything useful.
Am Sonntag will ich einfach nur auf dem Sofa rumliegen und fernsehen.
On Sunday, I just want to laze around on the sofa and watch TV.
'Rumliegen' (to lie around / to laze around) is a separable verb. The prefix 'rum-' goes at the end in a main clause. In subordinate clauses and in the infinitive, the verb stays together.
Deine Jacke liegt schon wieder auf dem Boden rum.
Your jacket is lying around on the floor again.
The verb 'rumliegen' (to lie around / to laze around) is colloquial. The prefix 'rum-' is a short, informal form of 'herum-'. In more formal contexts, you would choose other expressions.
Hör auf, nur faul rumzuliegen und hilf mir mal!
Stop lazily lying around and help me for once!
The meaning depends on the subject. If objects are the subject, it means 'to be lying around in a disorderly way'. If a person is the subject, it means 'to laze around'.
Überall lagen leere Flaschen rum.
Empty bottles were lying around everywhere.
When talking about disorderly objects, the location is often given with prepositions like 'auf' (on), 'in' (in), or with the adverb 'überall' (everywhere).
Warum müssen deine Bücher immer auf dem Küchentisch rumliegen?
Why do your books always have to lie around on the kitchen table?
to chill
Chillen and rumliegen can both describe relaxing and doing nothing on the sofa. Chillen emphasizes consciously relaxing in a laid-back way, while rumliegen often suggests useless inactivity. Use chillen for pleasant relaxation and rumliegen when you want to emphasize simply doing nothing.

Nach der Prüfung wollte ich den ganzen Nachmittag nur auf dem Sofa rumliegen.
After the exam, I wanted to spend the whole afternoon just lying around on the sofa.
Nach der Prüfung wollte ich mit Freunden auf dem Sofa chillen.
After the exam, I wanted to chill on the sofa with some friends.