TO HAVE TWO LEFT FEET

БЫТЬ ПЛОХИМ ТАНЦОРОМ 

Explanation:

To be a very bad dancer. 

Sorry, I wouldn't like to dance with you - I've got two left feet.

NOT TO HAVE TWO PENNIES TO RUB TOGETHER 

БЫТЬ ОЧЕНЬ БЕДНЫМ

Explanation:

To be very poor

When I was a child, my mother didn't have two pennies to rub together.