Writer's Block sucks. Writer's Brick sort of sucks and rocks at the same time. What exactly is Writer's Brick?

According to Janene Mascarella:

Writer's brick is when you get slapped upside the head with so many potential markets and article ideas that you become completely dumbfounded and down for the count. You are quietly researching a topic or drafting an article, when WHAMMO; out of nowhere you are suddenly slammed with incredible ideas, one after the other, until everything goes fuzzy.

For more on what to do when it it hits you, read on here.