I was watching a Gene O'Neil clip and he throws a couple of them in this song, one at 1:22, and one at 1:49. Listen closely, he does them quick.
https://www.youtube.com/watch?v=vroXlv9gXTI
I've heard many players do them over the years, Lloyd, Buddy, Weldon, and others.
First of all, what is the correct term for the lick?
Second, how do you do it?!?
Other than rolling the thumb & fingers in a quick movement, I don't know how they get that unique sound with this lick.
Despite many years of playing, I've never been able to duplicate the lick - and back in the day, I had pretty fast fingers, lol.
Any tips?