A term used to lengthen the lasting appeal of a "Holla!". Mostly used as a way to show approval of something, the term can also be used at will and does not need to make sense in conversation. A good bro will always reply with a loud "Holla!".
Thomas: Let's go get some ribs, and watch the game.
Christian: HOLLA AMOEBA!
Thomas: HOLLLLAAAA!
Or...
Thomas: Yo, what train are you taking?
Christian: HOLLA AMOEBA!
Someone who is very sneaky. A devious amoeba has the ability to cause trouble without making his/her involvement known.
Person 1: "Did you hear about Andrea and Mikey?"
Person 2: "Yeah. I can't believe they broke up."
Person 1: "Something seems fishy. I think there might be a devious amoeba involved here."