Blam!
From Halopedia, the Halo wiki
Template:Ratings Template:Realworld 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."[1]
"Blam!" is now used to censor curse words on the Bungie.net forum, the Weekly Updates[2], and to censor inappropriate content names in Halo 3. It is most likely a tribute to the word itself. Many non-Bungie users have caught the habit and use it abundantly.
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.
An occasional glitch occurs with network latency. A player can name a map anything, and no matter the result, a notice of censorship will pop up telling you that it's name must be blam!
