Blam!

BLAM! was the code-name for Halo: Combat Evolved, before it was completed. It was used to replace the original name "Monkey Nuts", because project lead Jason Jones couldn't bring himself to tell his mother he was working on a game called Monkey Nuts.

Blam! is now used to bleep out curse words on the Bungie.net forum, most likely as a tribute to the word itself.

The word was thought of because Bungie's Chicago office was located near a very busy street that had numerous near collisions between cars, Robert McLees would yell "BLAM!" So there was a sense of completion.