What does big fat mean by pressing invisible wings?

Crushing invisible wings is a joke, which means that you have not offended others, but you are still accused. My daughter-in-law is unhappy these days because a joke crushed her invisible wings. I am careful in everything, lest I commit holy anger. However, when I was sitting on the sofa watching TV after dinner, I was kicked for no reason. It was my big fat that crushed her invisible wings.