jabber stabber
A jabber stabber is someone who gets off by finger-fucking while doing something dumb. That dumb thing could be dancing, singing, or throwing a tantrum.
She finger-fucked herself while doing the cha-cha in her socks.
He came while singing 'Let It Go' at the top of his lungs.
She finger-fucked while throwing a tantrum in the middle of a grocery store.