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.
Boy 1: Stacy fingered my ass so good last night before she blew me that I could hardly walk today!
Boy 2: Yeah, I wish my girl would do that for me.
September 20, 2008