Sit on (one's) ass informal slang verb phrase rude
Used to say that someone is not working or producing anything
Stop sitting on your ass, help me clean up!
You're not paid to sit on your ass.
I'll dimiss all those who sit on their ass and wait for quitting time.
To be satisfied with past achievements and stop trying to achieve something new..
To take a seat and relax
When you have no work to do, you are more likely to do something harmful or evil.
To remain seated or balanced atop something
The verb "sit" should be conjugated according to its tense.