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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.
by Teddy Bear3456 August 22, 2012
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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?"
by Ashley Jackson November 28, 2006
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