Bricks refer to training on two disciplines during the same workout, one after the other with minimal or no interruption in between, just as you would do in a race. Usually when people talk about bricks they refer to a bike/run workout, but bricks could also refer to a swim/bike workout or to a run/bike workout (if you are training for a duathlon).
-- From Beginner Triathlete

They suck! But in a good way

Got in 6 miles today -- was supposed to be 4 miles, but I dropped my sunglasses somewhere on the trail, and had to go back to find them. Whew -- they they were, untouched, right in the middle of the trail! So, couple of miles extra, and the dog got to pass the creek two extra times which made her day!
Jes