Furryouso

No... it's not the fast and furious joke... there are different possibilities between the word and the meaning....

- It's a direct to call you a furry using "you so" as a reference at the end.

- A way of calling a rabid furry "furious"... but it will make more sense in Portuguese.. which would be like "furioso".

- A joke quoted at the beginning of the dictionary, probably the person behind the joke thought of it within 10 seconds.