It is a boxing expression to tell a fighter that he should attack the liver of the opponent. It is used when the fighter who receives this message is shorter than the other. To beat him, makes immediate rival to crouch to achieve a knockout punch in the face and find the Knock Out ( Knockout ).
Dale is the second person singular of the verb give and below is an adverb of place which means what is under something. Together it comes to mean an order that someone hit on the bottom of something or someone. Is unknown if is is of an expression used in countries of language Hispanic with any meaning concrete.