1
haikai (collective name for haiku, haibun, haiga, senryū, etc.)
2
haikai no renga (humorous, often vulgar style of renga which emerged in the 16th century)
See also:
俳諧の連歌 (はいかいのれんが)
3
absurd;comical
Other forms
誹諧 【はいかい】 (rarely used kanji form)