Blowing a raspberry, strawberry or making a Bronx cheer, is to make a noise that may signify derision, real or feigned. It may also be used in childhood phonemic play either solely by the child or by adults towards a child to encourage imitation to the delight of both parties. It is made by placing the tongue between the lips and blowing to produce a sound similar to flatulence. In the terminology of phonetics, this sound has been described as a voiceless linguolabial trill, [r], and as a buccal interdental trill, [r].
A raspberry is never used in human language phonemically (that is, as a building block of words), but it is widely used across human cultures.
The nomenclature varies by country. In most anglophone countries, it is known as a raspberry, which is attested from at least 1890, and which in the United States came to be abbreviated as razz by 1919. In the United States it has also been called a Bronx cheer since at least the early 1920s.
Blowing a "raspberry" derives from the Cockney rhyming slang "raspberry tart" for "fart". Rhyming slang was particularly used in British comedy to refer to things that would be unacceptable to a polite audience. "Raspberry" was also given the pronunciation spelling "razzberry" in the US, of which "razz" is an abbreviation.
....the East will grin and give Western football the jolly old Bronx cheer.
While the crowd was giving vent to the 'Bronx cheer' and hurling garlands of raspberries from the gallery....