Winespeak always includes references to oak (even the Wine Curmudgeon is guilty of this), and most of the references always seem to describe the wine as toasty and oaky. This can be quite confusing, since the relationship between wine and oak is not obvious.
How can something made with grapes be toasty and oaky?
That's because some wines are aged in oak barrels. Generally, but not always, these are more expensive wines, and they are more often red wines than white wines.
Oak aging helps temper the acid and tannins in red wine, making it more drinkable. The only white wine that gets much oak is chardonnay, and California has turned this into a unique style — rich, buttery, oaky, almost caramelly wine. I recently tasted a high-end chardonnay from a major California producer, and the wine was spot on for creme brulee. More, after the jump: