interjection
no way!; what nonsense!; how can that be?
Jocular, humorous interjection expressing disbelief or rejection of an absurd statement. A pun on そんな馬鹿な (sonna baka na).
See also: そんな馬鹿な
「明日から会社が休みだって」「そんなバナナ!」
"They say the office is closed from tomorrow." "No way!"
彼が宝くじに当たったって?そんなバナナ!
He won the lottery? What nonsense!