When a black man usurps the romantic machinations of a white man on a lady, and it turns out he's either got way more game or she likes men of color better anyway.
John thought things were moving in the right direction after chatting all night with Stacy. But when Tyrone came over with her next drink and a smile, John became all but forgotten by Stacy. Total Cauc block.
The act of preventing someone from watching The Big Lebowski. Refers to the White Russian, also known as the Caucasian, the Dude's favorite beverage.
We were all trying to get together to watch The Big Lebowski, but Jamie had to Cauc Block us...