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1.
a type of short form zen poetry that's the same as haiku (ie., 5-7-5 syl per line) but which has reference to altered states of consciousness.
When the doors of perception are thrown wide or torn off their fasteners; short verse constructs such as highku can capture moments, realizations and altered glimpses of other states of consciousness.
by jim christ June 10, 2009
 
2.
A standard haiku, only written when high.
My highku:

The great octopus,
Strangles with his tentacles,
And shows no mercy.
by turtlejeww November 20, 2010
 
3.
A sub-form of fratku, which is itself a variant of haiku. A three-line poem about marijuana. Must follow a strict 5-7-5 syllable count.
Sample high-ku:

Herbal remedy:
Rid yourself of all your ills.
Then laugh your ass off.

I love the U.S.,
it’s as perfect as I, though
not nearly so high.
by Dusty Cioffi May 06, 2008