This is the I'm a Dictionary game, where the person above you makes up a word, and you define the word they made up. Then, you post your own made up word, and the game keeps on going. A definition of the word above you is required to play the game, but anything else you want to add, like showing an example sentence of how the word is used, or posting what the pronunciation would be. If you want to get real technical, you can look up the roots of the word to find out what it might mean. Of course, you could always just make up your own definition.
Here's an example:
Person2:"a citrus based suntan lotion and fortified drink. Phlerp
Person3:"A hiccup and a burp at the same time. Hauyjei"
Ok, so here we go!