What does Balls in the pants mean?

Balls in the pants meaning in Urban Dictionary

When someone desires to ask some one out, you put "the balls in jeans". Mainly useful for girls who want to ask down a man. Could also be used for a man that has been longing for a woman for a long period but doesn't always have the balls to confess.Variations may be simply saying the term, or putting awesome balls in each pocket to provide you with courage.