The term Bojack refers to 'non genuine'. A pack of DVC brand bags "to fit" Hoover type A, are "bojack" bags. It also refers to a vacuum salesman (usually door to door) that sell more than one brand (an Electrolux salesman that also sells Kirby is a "bojacker"). "Bojacker" also refers to someone who buys trade in vacuums from all the door to door guys and then resells them through his own store, eBay, flea market, etc. It's kind of like the word "hoosier". To someone from Indiana, it's not a cut down. To people in Missouri, trailer park dwellers are called "hoosiers", meaning "trash that won't burn". "Bojack" is a negative word, meaning "not good enough for the real thing". You wouldn't want to sell "bojack" bags or be a "Bojacker" yourself. The term is always used in a negative connotation way.