I'm sure whoever you got this quote from, purposely distorted it for humorous effect.
The scene is from "The Empire Strikes Back", here's a direct quote from the scene in Yoda's hut.
Luke - I am ready! Ben! I... I can be a Jedi, Ben, tell him I'm rea- [BONKS HEAD]
Yoda - Ready are you? What know you of ready? For eight hundred years have I trained Jedi...