2 sentences for 口头禅 (kǒu​tóu​chán)

1. “没问题”是他的口头禅。

   “ méi wèn​tí” shì tā de kǒu​tóu​chán.

   "No problem" is his catchphrase.

   Source: Dong Chinese Dictionary

2. 真正的修行不是挂在嘴边的口头禅，而在于内心的觉悟。

   zhēn​zhèng de xiū​xíng bù shì guà zài zuǐ​biān de kǒu​tóu​chán, ér zài​yú nèi​xīn de jué​wù.

   Real practice is not about repeating catchphrases; it lies in inner enlightenment.

   Source: Dong Chinese Dictionary