David hit the pavement with this grapple rap
This could be seen as a Biblical allusion to the story of David and Goliath, where a man fights and defeats a giant. Earl’s raps are Goliath, and he defeats a bully, David, contrary to the traditional story in which David wins.
Also, the name David following his use of the word “hassled” in the previous line is likely a reference to actor David Hasselhoff
ALSO: The “grapple rap” is probably a reference to his extensive background in the Korean martial art Hwa Rang Do (achieved black belt status). The fighting style focuses on grappling techniques.
Grapple is also a Snapple flavor(grape+apple) so it fits with the next line
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