plural yahoos            
        
    1
                    
                                capitalized                                  
              
          
                                                      : a member of a race of brutes in Swift's Gulliver's Travels who have the form and all the vices of humans                                      
                
                    
2
                    
                                          
              
          
                                                      : a boorish, crass, or stupid person                                      
                
                    
                                                                                                                            
                                                            ya·hoo
                    
                                                                                                              
                                                                                                                                  yä-ˈhü  
                                                      
                                                          
            
                                
              
          
                                                      : yippee                                      
                
                  —used to express exuberant delight or triumph
… her usually stoic grandfather shouted: "Yahoo! Way to go!"— Richard Sandomir
Richard Sandomir
"I'll be out there surfing—Monday, Tuesday, Wednesday, Thursday, Friday, Saturday, Sunday," he [actor/surfer Bruce Brown] says. "It makes you feel like a kid. You catch a good wave, and it makes you want to yell, 'Yahoo!'"— Mark Goodman
Mark Goodman
    
                
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  Merriam-Webster unabridged




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