The act proved to be extremely divisive, with some blasting the performance as "morally repugnant and totally out of keeping with a family show."
"AUZZY BLOOD on BGT was disgusting, not entertainment, pre-watershed and a terrible example to children watching a supposed family show," another viewer posted on X.
Even host Declan Donnelly struggled to watch, going as far as to threatening "I'll smash your face in" to audience members calling for Auzzy Blood to receive a golden buzzer.
The 65-year-old judge said: "We do have kids in the audience. I'm always looking behind, going do they like it? They actually, yeah they do. We probably will get some complaints, yeah."
After Auzzy Blood's performance, Cowell described it as "one of my favourite acts of the day, genuinely."
Amanda Holden described Auzzy Blood's performance as "horrifically brilliant" while trembling.
Akira Ohashi's scandalous nude act also attracted complaints
Elsewhere, Akira Ohashi also hit the headlines for his controversial routine which received 90 complaints.
The Japanese performer stripped off in front of judges and audience, using a variety of objects and skilful techniques keep himself barely covered, pushing ITV's censorship limits.
Responding to previous criticism, Akira said: "Those who watch the whole act realise there's nothing dirty about it. It's just a middle-aged guy with a tray, a bow tie and no other clothes".
Cowell had previously anticipated the backlash during the press launch of the new series.