Top Definition
A task that is extremely difficult, or requiring incredible amounts of skill or luck. The term comes from the name of a difficulty rating in downhill skiing.
Tim: How's the new code for the project coming?
Bob: Christ, man, it's a black diamond course. I think this part was coded by monkeys!

Playing quake while drunk is a real black diamond course.
by doomcup September 21, 2009

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