1. To "tell" or "serve" someone/if you got something right, and prove someone wrong, you say it.
Example: BUYA! I told you the answer to #
4 was 234!
2. When what you have to offer, etc., is better than another persons/when you or your possesions is better than someone else's.
Person
1: I got
FIVE computers!
Person 2: Guess how many I have?
Person
1: 2?
PErson 2: NO! 14...BUYA!!!