A fork of Rural Dictionary
Means "Boiling Lava Hot", from the comedian Jim Gaffigan's stand up skit, Beyond the Pale. Describes something hot that could possibly scorch the taste buds.
"Can I get a BLH?"
"BOILING LAVA HOT."
A shit so large it makes your asshole bleed.
Ronald: Dude, Frank just took a BLH! Man, I bet his asshole hurts like hell.
Ted: +10 Respect Points for him. That's almost impossible to do.