The first traveler, not knowing what CONGA is, finds himself choosing CONGA instead of death. A group of men then promptly put him on a table and rape his body in every orifice (see "HOLE"). Hard.
The second traveler, seeing this atrocity, decides he would rather die than be submitted to CONGA.
"VERY WELL," Says the African Warlord. "YOU HAVE CHOSEN DEATH... By CONGA!!!"
And so is the joke. CONGA is a word often repeated by those entranced by it's powerful meaning.
"What the hell you are you talking about, asshat? Cut that shit out."