Sydeshowing is when a bunch of your nigs get together and throw down for some real hella tight demonstrations of automotive. Often held in poor regions of the bay area, a good place for those involved to go dumm and get loose.
"Yo mang, what you doing tonite?"
"I'm turning tyte ones down at the sydeshow in my caddy, foo!"
"Go dumm at the sydeshow."
Analogous to mang, one of your best boys, your favorite smoking buddy, an overall kine guy.
Me- "Yo, what it is, mang?"
Todd- "Sup wit it cutt?"