What does the term "macaca" actually mean? A shady definition like "a french ethnic slur" isn't good enough for me.
It's a Belgian/French ethnic slur for people of dark-skinned North African descent. Allen probably heard the word from his mother, who is an immigrant from French colonial Tunisia (she is of French descent). What's funny is that Sidarth (I've actually met this guy) isn't even North African at all, but Indian instead.
This is George Allen's "George Romney moment," a stupid comment that ruins a Republican Presidential contender's chances.