His character is meant to be boorish -- chomping and drooling and gurning -- but beneath the flinty exterior is also meant to lurk a diamond-hearted softie.
The time limit ensures that a participant will not be stuck with a boorish match for very long, and prevents participants from monopolizing one another's time.
Something that is "yabo" is usually unrefined, gigantic, coarse, childish, colorful, self-conscious, permanent, loud, superficial, vulgar, snobbish, boorish, etc.
