Sitting On Your Thumbs
A term meaning commonly used to mean overweight and lazy, as the act of sitting on one’s thumb implies that they aren’t doing any work and are “flattening” the finger with their weight.
John: “You have been doing nothing except sitting on your thumbs all day, that’s why none of the other employees like you and you’re clinically obese.”
sitting around with your thumb up your ass
Doing nothing.
What have you been doing all day? Sitting around with your thumb up your ass?