i think that's what your talking about. At least, that would be my definition. I hope I helped!
they could be anal beads. those are a little freaky though haha
Ok so thunder beads are basically special anal beads. These things are amazing for giving a girl an orgasm, we used some when we were having sex and she said that they gave her some amazing orgasms. If you want to know more comment and I cam explain it some more.
Here is a link.
Are you referring to another type of beads?