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Blowing a raspberry, strawberry, razzing or making a Bronx cheer, is to make a noise similar to flatulence that may signify derision, real or feigned. It is made by placing the tongue between the lips, or alternately placing the lips against any area of skin, and blowing. When performed against the skin of another person, it is often a form of tickling.
A raspberry (when used with the tongue) is not used in any human language as a building block of words, apart from jocular exceptions such as the name of the comic-book character Joe Btfsplk. However, the vaguely similar bilabial trill (essentially blowing a raspberry with one's lips) is a regular consonant sound in a few dozen languages scattered around the world.
Spike Jones and His City Slickers used a "birdaphone" to create this sound on their recording of "Der Fuehrer's Face", repeatedly lambasting Adolf Hitler with: "We'll Heil! (Bronx cheer) Heil! (Bronx cheer) Right in Der Fuehrer's Face!"
In the terminology of phonetics, the raspberry has been described as a voiceless linguolabial trill, transcribed [r̼̊] in the International Phonetic Alphabet, and as a buccal interdental trill, transcribed [ↀ͡r̪͆] in the Extensions to the International Phonetic Alphabet.