"Would your friend care to rumba?'"

The term rumba is used to describe two different kinds of dance:

It describes a group of Afro-Cuban dances, the most famous of which is known as the guagancó, a particular feature of which is a pelvic movement known as a vacunao. It is usually danced by a man and a woman; the man's movements are sexually suggestive, whilst the woman's movements are defensive.

Alternatively, rumba is a type of ballroom dancing based on the latin dance-style, the bolero-son.

The guagancó: