a Bronx cheer
A sputtering noise made by pressing the tongue and lips together, used to express either real or faux contempt, mockery, or displeasure; a raspberry. Primarily heard in US. The fans collectively gave the opposing team a Bronx cheer when their relief pitcher walked onto the field.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
a Bronx cheerAMERICAN, INFORMAL
A Bronx cheer is a rude noise that you make by putting your lips together and blowing through them. He greeted the news with a loud Bronx cheer.
Collins COBUILD Idioms Dictionary, 3rd ed. © HarperCollins Publishers 2012