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.我不會說這種語言。
N-UNCOUNT
行話；隱語
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.用唱片業的行話來說，就是他想買下那首歌曲的版權，然后包裝推出。...an author who writes in a lurid lingo, freely punctuated with crude expletives.文筆間充斥著低俗的暗語和隨興插入的粗話的作者
英漢詞典釋義
n.
聽不懂的話(指方言、術語等); 隱語;外語
He became skilled in several tribal lingoes.他精通幾種部族的語言。
英英詞典釋義
Noun
1. a characteristic language of a particular group (as among thieves);