to insert one or more fingers into either a
girl's vagina or a guy's anus, both causing extreme sexual pleasure. when performed on a
girl, the fingers are thrusted in and out of her vagina, most especially on the clitoris. when peformed on a guy,
see "prostate massage," the fingers are inserted into his anus and are either thrusted in and out in a similar fashion or they are used to masage his insides, which can sometimes lead to an orgasm even if his
penis isn't being stroked or sucked.