A method of smoking hash, opium, or kief by heating butter knifes with a lighter and breathing in the smoke expelled off of the knife. When the drug is to fine or caramelized to smoke using traditional methods hot knifing is an accepted alternative although you typically wont have as effective inhalation as you only inhale the fumes rising off of the knife as opposed to an airtight seal when smoking a pipe or joint.
I dont have a piece, but we can hot knife it.
The kief is too fine for a pipe, lets hot knife it.
The hash is too gooey for my pipe, lets hot knife it.
My mom noticed the res on our butter knife from when we hot knifed that hash.