"Fresh Spawn" or FS in the IFR Subforum is a pejorative term used by experienced forumers to describe a particular type of forumer with these traits :
-Low quality threads
-Ruled out ideas
-Joins for a day, leaves forever
-Bad grammar / Wrong language / Insults
The origin of the term comes from the fact that the first vBulletin Rank (for people with 0 to 5 posts) is "Fresh Spawn", and most of the people with the FS traits above were in the "Fresh Spawn" rank.
Hate against Fresh Spawns grew in the IFR Subforum to the point that someone even tried to make a petition with new rules to prevent the Fresh Spawns to do things in IFR.