Fix body language - When a guy places his hand in the lower back of a girl, what does it mean? What does this body language means?

When a guy places his hand in the lower back of a girl, what does it mean? What does this body language means?

Guys, help :) This happened several times when we are practicing for a cheering competition.

well you have to put it into context. it could mean hes interested or hes shooing her out of the way. maybe hes blind and he thinks her back pimples are brail.... give more details
the guy want to touch your butt........means he may had crush on you.......
That is called a guiding hand, and it is the mandatory position for ballroom dancing. But a man should not touch a woman without her permission. Jimmy Carter caused a bit of offense when he touched the Queen of England to guide her through a doorway. Such a gesture would not have been noticed at all in the USA.
Depends on the status of the guy and the girl. Is he of similar age to her, or is he teacher, coach or similar? It probably means he fancies her, but could have many other interpretations.