Uh huh huh

Peoples stereotype (non fans) of Elvis is a fat guy in a jumpsuit with a curled lip saying thank you very much and uh huh huh

Apart from in 'all shook up' 'Good Luck Charm' and maybe an odd time in other songs from what I've seen and heard "uh huh huh" wasn't like a regular thing and just seems to of been labelled on him

Did he sing/say it more often or is it something just exagerrated?

Every artist has something...wich other artist (comedian) blows up, i think this the case with this uh huh huh stuff,it's even on the comeback special deluxe set.