2006I often hear people asking "What's that mean?"
Is this question grammatically correct? It's not correct.
"What's" is not a correct form of 'What does", and and I don't believe you will see that in careful written English. But you certainly will hear it spoken.
Here are the three statements based on my guess:
1. This has been used by native speakers, and here --'s -- is short for 'does'; (However, it sounds weird to me that 'does' is used as short as --'s --) Native speakers do say that, and I would guess that native speakers invented it. It's just nonstandard oral English.
2. This was "invented" by ESLs and eventually adopted by native speakers;
3. This was only used by ESLs who don't have good sense of grammar, and when you hear native speakers saying that, they're teasing. They are not teasing; they are just using the English I described above.
Which statement is right? Or all are wrong?