Sometimes speaking with an AFOL or reading their online posts can have a layperson scratching their heads. Here is a list (not a complete list in any way shape or form) of many of the more common terms you may encounter.
AFOL – Adult Fan of LEGO
BURP – Big Ugly Rock Piece
FOL – Fan of LEGO
LUG – LEGO User Group aka clubs that are often, but not always recognized by The LEGO Group as an RLUG.
LURP – Large Ugly Rock Piece
MOC – My Own Creation
MURP – Medium Ugly Rock Piece
SNOT – Studs Not On Top. Any brick or piece with studs on the sides.
TFOL – Teen Fan of LEGO
TLG – The LEGO Group. A shortening of the company’s name by fans.
Travis Brick – a 1×1 modified brick with four studs (one on each side).
WIP – Work In Progress
I will be adding to this list of terms as it is a WIP. If you see any errors or would like to see something added, please contact me. For additional terms or more in depth definitions check out The Brothers Brick’s LEGO Glossary.