Apparent misspelling of the word 'insane'.
Originates from the "How is babby formed" Flash cartoon of 2 cavemen discussing how babies are formed.
The cartoon got it's 'text' from a Yahoo Question.
"How is babby formed?
how is babby formed?
how girl get pregnant?
They need to do way instain mother> who kill thier babbys. becuse these babby cant frigth back?
it was on the news this mroing a mother in ar who had kill her three kids . they are taking the three babby back to new york too lady to rest my pary are with the father who lost his chrilden ; i am truley sorry for your lots"