First of all, one of the mods should post a NSFW warning in your subject line, due to the cursing and the ethnic slur. "Don't worry your _____ head" is an AmE expression that simply means the same thing as "don't worry." Quite commonly a male will say to a female in a demeaning tone "Don't worry your pretty little head". In this case the person worrying is of Latin-American or Hispanic heritage, as "spick" is a derogatory term for that ethnic group. Please don't ever use it in casual conversation.
Student or Learner