There's a few:
1. A white boy cocksucker.
2. A poser.
3. A homosexual kid who has white stained cum teeth.
4. The name you give a dick that is a chick's.
5. When some straight-up white boy thinks he's black or ballin'.
6. It could mean all of the above.
Yo-pang kid, "Wat-up. Look at my white teetch."
Other kid, "Get out of here you yo-pang."