My boyfriend is poor and limps with her. What does this joke mean?

My best friend made a boyfriend a while ago and spent all day together.

I went shopping together today and saw her limping.

Ask her what happened. She minced and answered after a while: "It's not because of the male ticket."

I don't understand: "What happened to him?"

Girlfriend pretends to be mysterious: "In one word, poor."

I continued to ask, "Does his poverty have anything to do with your limping?"

A little dirty ~ ~ ~