Mr. ducky (a duck puppet) is used as a character created by Jordan Romani, better known as comicfire7, a youtube partner who often uses this puppet in his youtube videos giving it a high-pitched duck-like voice, although Jordan has other less frequently used characters, Mr ducky is probably the most representative of his comedy sketches. Mr ducky often calls people "pussy" and is even present on his current youtube banner.
Mr. ducky: wow man I'm sorry
Jordan: since when have you given a soaring fuck about me?
Mr. ducky: I don't
Mr. ducky: cause you're a pussy...and I don't sympathise with pussies