1. A perversion of the phrase West Side. This pronounciation is often used by white people in conjunction with a brandishing of their hand with the middle and ring fingers crossed, forming a "W" shape.
2. Not the East Side, South Side or North Side, but the side in the other compass direction.
Meek White Child: :: Brandishes hand :: Wesside.
Imposing Black Male: :: Brandishes hand :: Wesside.