What is it meaning?

Hi Alan and Torsten! Unfortunately I don’t know it!!!
To laugh with the other side of the mouth… What is it?’

Thank you

Hi Student,

If you laugh out the other side of your mouth you laugh secretly, especially at another person that might have tried to make fun of you before.[YSaerTTEW443543]

TOEIC listening, photographs: A family meal[YSaerTTEW443543]

Dear Torsten! Thank you very much for very interestung explanation!
It is really interesting!!!