Some Old Hippie Caught Another Hippie Tripping On Acid phrase1 •(humorous) A mnemonic used to help people remember the different trigonometric functions: sine is opposite over hypotenuse; cosine is adjacent over hypotenuse; and tangent is opposite over adjacent.Another high school teacher told me that he uses a similar acrostic, but his is as follows: Some Old Hippie Caught Another Hippie Tripping On Acid. — 2003
