i think that should be slang. slang should be their second language apart from learning another language like french ,italian , chinese, japonese

In the US, it is common to learn Spanish.

In the UK, French is often the first foreign language which we learn.

@Som

I've thought the same thing before.

After all, it's no need to learn another language for general Anglophones.

For the most part, there is no need for Anglophones to learn another language, because their native language happens to be the most prevalent global second language anyway. One can expect exceptions here, but why should anyone bother to learn a second language where their own suffices for nearly all situations?