Geriaphiliac Share definition Flag One who bangs, or has other sexual relations (i.e. oral sex, anal sex, handjobs, deep kissing or holding hands) with a geriatric a.k.a. old person. "Oh that Chantel, always messin' with those old men, she's a geriaphiliac." Geriaphiliac by Red Killwell July 3, 2007 Get the Geriaphiliac mug.