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1.
1. Used in a joking manner towards gross old men who flirt with or try to date girls who are severely younger than them.
Do you see that old geezer over there? That "fossildick" asked out my 19 year old sister.
by Jendoll July 31, 2006
 
2.
Elderly men who flirt with and/or try to hook up with women 23 and younger.

Old men who want to date young women.
Yuck, that nasty 'fossildick' keeps staring at me. I heard he followed you around last night and tried to get your phone number.
by J-doll July 29, 2006