look up any word, like blumpkin:
A player created railway built under another players house in Minecraft. It often leads to players rage quiting in reaction to the Mullo Gaff. It is named after Mullo, the loveable scamp.
Dean:They're biulding a Mullo gaff under your house, Cian.
Cian:*Screams, drops TNT in said Mullo gaff and rage quits*
by Mullo2kaii10 January 09, 2013