Native "tongue" is used to replace "language" in this context, I guess.
I've heard & read that expression several times before. Even used it myself. But what do I know, I'm german...
Most germans even would deny or lie about the fact that we are taught English in school & when listening to some of my friends trying to squeeze out some english sentences, you'd just drop laughing...
But anybody - besides the native speakers - comes across troubles with a language they learn "on the fly". Usually that doesn't include the grammar...
Or do you tell people who are not too familiar with your language, how to conjugate the causative verb, instead of trying to understand their question?
EDIT: Dang! YugaCurry beat me to it.
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