The first time Bugs uses the phrase is in the cartoon Wild Hare 1940. The rabbit walks up to Elmer Fudd who is hunting for him with a large gun and casually asks, “What’s up Doc?”
É a frase original deles. Pode ser inspirado em What's up Phrase
que aparece anteriormente
The phrase appears in Jack London's The Sea Wolf (1904), chapter 25 (-- "What's up?" I asked Wolf Larson.--)
Another referance to 'whatsup' can be found in a short story The Adventures of Shamrock Jolnes from the collection Sixes and Sevens (1911) by acclaimed American short story writer O' Henry (1862-1910). The character Shamrock Jolnes says, "Good morning, Whatsup."