Mierde en palito = shit on a stick. I learned it from an old school Puerto Rican, and he used it for two things: an arrogant person (not just regular shit, but shit on a stick) and also for when someone is “stirring the pot” or making a drama filled situation worse via gossip, etc (stirring a pot full of shit). But primarily, it is well suited for the arrogant person huffing their own farts and thinking it is the aroma of personal worth.

(There was also the time a friend of mine got tired of looking after young kids and sent two demented nephews of his running through Disney World to see how many people they could greet in Spanish after sincerely telling them that the standard greeting in Spanish is mama me la pinga, but that’s more of a direction as opposed to a label. Try mama me la pinga, pinchi pendejo for a nice combo phrase. Also note that online dictionaries often get this wrong: it’s the verb mamar and you’re not telling your mom you’re a dick, lol)