瞎编

tā yǒu diǎn yán guò qí shí dàn bìng bù xiā biān

他有点言过其实，但并不瞎编。

He exaggerates, but he does not lie.

chéng yǔ kě bù néng zì jǐ xiā biān a

成语可不能自己瞎编啊。

You can't make up idioms yourself.