variants  
 or whammo    
        
    
                                
              
          
                                                      : with violent abruptness                                      
              
                             
everything was going well; then wham the deal fell through
                         
                
                    
            
              whammed; whamming            
        
    
                                
              
          
                                                      : to propel, strike, or beat so as to produce a loud impact                                      
                
                    
                                
              
          
                                                      : to hit or explode with a loud impact                                      
                
                    
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  Merriam-Webster unabridged




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