A Japanese form of poetry used by lazy people.

A phrase to describe someone who is cognitively degenerating. Synonym of "going off the deep end". Can have varying degrees of severity.

Reference to the song "Hey You" by Pink Floyd. The line "and the worms ate into his brain" makes no sense in an otherwise linear and literal narration throughout the lyrics.

Haiku are strictly about nature. All of the definitions posted here are incorrect, those are senryu, which are haiku that do not deal with nature.

A strict form of Japanese poetry consisting of 3 lines.

Format:
First Line 5 Syllables
Second Line 7 Syllables
Third Line 5 Syllables

this is a haiku
it has seven syllables

it also has five

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a haiku is a Japanese poem including 5 syllables in the first line, 7 in the second, and 5 in the last ( only three lines)

A retarded way to express your feelings. By using syllables. A common format is 5 syllables, 7 syllables, 5 syllables.

Haikus have three lines.
The first has five syllables,
Then seven, then five.

Proper haikus are about nature, especially the seasons; the structure tends to be more important than the words.