People sometimes refer to a foreign language, especially one that they do not speak or understand, as a lingo.
例句
I don't speak the lingo.我不会说这种语言。
N-UNCOUNT
行话；隐语
A lingo is a range of words or a style of language which is used in a particular situation or by a particular group of people.
例句
In record-business lingo, that means he wanted to buy the rights to the song and market it.用唱片业的行话来说，就是他想买下那首歌曲的版权，然后包装推出。...an author who writes in a lurid lingo, freely punctuated with crude expletives.文笔间充斥着低俗的暗语和随兴插入的粗话的作者