まゆつば
dubious tale; cock-and-bull story; questionable information; taking care not to be fooled
Also written 眉つば
Noun
その男おとこが、自分じぶんは百万長者ひゃくまんちょうじゃだとあのきれいな女おんなの子こにいったことはまるっきり眉唾まゆつばだった。
The man's statement to the pretty girl that he was a millionaire was all eye-wash.