yo Murdoc this is my explaination for that line:

~your technique's baseball,huntin for nuts~
throwin a ball straight- if someone calls you a nut,there talkin bout ya brain
his technique is straight forward,im aiming for his brain--final meaning--

~mines basketball,nigga's throwin up~
throwin a ball up n over oppose to straight forward-my style sick(good)
mines up n over,sick style--final meaning--
i hope this clears up the line for ya man,i think its a metaphor/metonymy