nb4
If a thread is created wherein the rules of the forum are comprimised, users try to get in a comment 'nb4' they know a mod will lock (or close) the thread.
Get the nb4 mug.
NB4R
no but for real
nb4dalok
Used in online forums. Shorthand for "In before the lock." When material is posted that is frowned upon by the moderators of the forum, they may lock the thread. Some people think it's "kewl" to get in a few words before the thread is locked.