A 'booty plunderer' can be either be another way of saying a treasure searching pirate or in my case, someone who wishes to get some most plentiful ass. Butt of course the best part of the destination is the journey ass the saying explains and therefore just like a treasure thirsty pirate, an ass hungry booty plunderer is somewhat of an assventurist themselves.
Woah you seen the way Ian talks to girls!? He's such a booty plunderer