Fart Lava 

The unexpected execretion of liquid shit when you do a fart.

Bill: Man I've been so sick the last 3 days. The other day I did a fart in bed and the next thing I know there's a steaming puddle of fart lava on the sheets
Ben: wtf? who r u!

Fart Lava by aussiemandias September 12, 2009

Lava Fart 

A fart that burns your butt very badly and it stings.

Ow dude i just lava farted on a blanket

Lava Fart by Jeffy 4444 May 27, 2008