When you forego sleep and other obligations to complete an absurd amount of work in a short amount of time. Similar to pulling an all nighter but done without a deadline and the work isn't total garbage.
Yo, James just woke up. It's 3PM!
Yea, he Bruced three new songs last night... I don't think he slept until 7AM.
Bro, I called you ten times! Why didn't you answer?
Sorry man, I was busy Brucing my first screenplay.