In a pig's ass! American rude slang
''In a pig's eye'' is a variant of ''in a pig's ass''.
A way of expressing that someone doesn't believe that something will happen or come true
"In the future, scientists will help humans fly handily like birds." - "In a pig's ass, they will."
"If I try my best to learn studiously, I will study in Harvard University." - "In a pig's ass, you will."
Become a millionaire? In a pig's ass I can.
To strongly oppose something
1. To cut somebody or something harshly or severely
2. To criticize someone or something harshly or severely
Used when one strongly dislikes or is unable to tolerate someone or something.
One thinks that the thing referred to is ridiculous, baffling, fantastic, or incredible.