Ooooo... Swahili lesson!
Jambo literally translates into "Hello, now speak to me in English." In Africa, often tourists know little more than Jambo but that lets the locals know what language to speak in. Eventhough it may seem slightly naive, it also allows local speakers to quickly clue into a tourists language who may then spend more money.
Hamjambo is the same as Jambo but is said when you are speaking to a group rather than a single person.
Asante = "thanks"
Asante sana = "thank you"
Karibuni = "welcome"
Karibu sana = "your welcome"
Kwa herini = "go well"
Kwa heri = "goodbye"
Poly = "slow" (saying a word twice like poly poly generally adds "very" to the statement... thus, poly poly = very slowly)
Tamu = "sweet"
Harambe = "coming together as one" or "meeting/gathering place"
Dawa = "medicine" (thus the Dawa Bar is actually the "medicine bar"... hmmmmm...

: )
Simba = "lion"
Pumba = "warthog"
Tembo = "elephant"
Twiga = "giraffe"
Duma = "cheetah"
And one of my personal favorites,
Rafiki = "friend"... so if you say
Jambo Rafiki, you are saying "Hello friend".
That should get you by in the Harambe portion of Animal Kingdom.
Other useful words in Asia -
Namaste = "my soul greets the greater soul in you";
Serka Zong = "Fortress of the Chasm";
Anandapur = "Place of all delight"