拿着机关枪横扫日本狗
[ná zhe jī guān qiāng héng săo rì bĕn gŏu]
A patriotic or nationalistic themed idiom used in special historical backgrounds like World War II against Japanese militarism, reflecting anger towards Japan. But today, the word '狗' contains strong negative connotations and is considered offensive if used to call other nations or races.