Blowing a raspberry or strawberry or making a The 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 . 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...