自家 じか薬籠 やくろう ちゅう ものじゃないです
jikaya kurōchūno monojanaidesu

Noun
Desu Copula
Negation Auxiliary

The polite negative form of 自家薬籠中の物

1. It's not something I'm good at.; It's not my forte.; I'm not skilled in that area.

Negative
Polite
Casual Register