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1.
A young man, boy or student with an unhealthy interest in fossils, paleontology, or geology in general.
Fossil Boy is out digging for rocks again
by uncle_fester June 09, 2009
 
2.
A young man, usually bearded, who engages in the activities of old men. E.g. boules, chess, and the drinking of gin or port.
''Why didn't **** come out tonight?''
''He's having a quiet night in with a glass of port and the Monty Python collection.''
''.... Fossil Boy
by scaryfairy June 09, 2009