Agent noun of finger; one who fingers, especially in the sense of sexual stimulation.
1991, Diana Fuss, Inside/out: Lesbian Theories, Gay Theories, page 250:In fact, the rose appears to be the focus of interest for not only the fingerer but for the fingered, since the bouquet's holder is modestly casting her eyes upon it rather than upon her partner.
2001, Phil Phantom, {ASSM} Stubborn Slut Group: alt.sex.stories.moderatedDiedra smiled back like a first-time daughter fingerer, wiping her hand on the towel
2001, Cool Sexy Guy, Story: Cheerleading Camp Group: alt.sexThe girls were having lots of fun rolling around on the bed, though Kacie was a much better fingerer and occasional eater.