Term used to describe intense geologists or Earth Science teachers who obtain erections at the sight of young men, or smooth cleavage in metamorphic rocks. Usually prefer minerals with a hardness less than that of their own. The majority are teachers at the Junior High Level, but some stray into higher professions.
Dude I swear our Earth Science teacher got a hard one when he looked at that basalt.
I know, he must be a Rock Man!