expression
no way!; that's impossible!; I can't believe it!
Jocular, slangy exclamation derived from ありえない. Used to express disbelief or shock in a playful, exaggerated way.
See also: ありえない
え、もう全部食べたの？ありえんてぃー！
What, you already ate it all? No way!
テストで満点取ったって？ありえんてぃー！
You got a perfect score on the test? I can't believe it!