expression
can never be able to; there's no way one can
Emphatic negative potential expression; formed from できる + っこない, meaning 'absolutely cannot do' or 'there is no chance of doing'. Used in casual speech.
See also: っこない
こんな難しい問題、できっこないよ。
There's no way I can solve such a difficult problem.
彼が一人でそれを運ぶなんてできっこない。
He can never carry that by himself.