Easy, you just say a word, the other person states that they don't know about definitions, and then they give the wrong definition.
For example . . .
Winmaster1: exaggerate Player 1: Sorry, I've never heard of this word. It means to increase the amount if people in a spaceship, I'm sure. The next word is wand. Player 2: Don't know what the definition is, but I think it means to call people bad names.
. . . and so on . . .
Since I'm the first person, I don't need to tell a definition.