Blowing a raspberry or strawberry or making a Bronx cheer is to make a noise signifying derision (and/or silliness), made by sticking out the tongue between the lips and blowing to make a sound reminiscent of flatulence. In the terminology of phonetics, this sound can be described as an unvoiced linguolabial trill [r̼̊]. It is never used in human language phonemically (i.e., to be used as a building block of words), but it is widely used across human cultures.
Nomenclature varies: in the US, Bronx cheer is sometimes used; otherwise, in the US and in other English-speaking countries, it is known as a raspberry, rasp or razz—the origin of which is an instance of rhyming slang, in which the non-rhyming part of a rhyming phrase is used as a synonym. In this case, "raspberry tart" rhymes with "fart". It is first recorded in 1890.
The term "Bronx Cheer" is used ironically because it is not a cheer, it is used to show disapproval. The term originated as a reference to the sound used by some spectators in Yankee Stadium, located in the Bronx, New York City.
One of the most famous uses of the Bronx cheer is in the song "Der Fuehrer's Face" (from the Disney animated film of the same name), as recorded by musical comedian Spike Jones in 1942, which shows disdain for Adolf Hitler with the repeated refrain "We Heil! (Bronx cheer) Heil! (Bronx cheer) Right in Der Fuehrer's Face!"
The term "flipping the bird", better known nowadays as "giving the finger", an obscene gesture, was also once used in reference to the Bronx cheer. For example, the "razz" sound made by the Spike Jones orchestra for "Der Fuehrer's Face" and other songs was produced by a device called the "birdaphone".
Blowing a raspberry or making a Bronx cheer is to make a noise made to make fun of a person or persons, made by sticking out the tongue between the lips and blowing to make a sound similar to flatulence. The term "Bronx Cheer" is used sarcastically because it's not a cheer, it is used to show disapproval. The term was created as a reference to Bronx, New York, and the call used by spectators in Yankee Stadium. It can be classified phonetically as a "linguolabial trill".