A fork of Rural Dictionary
A rock hard penis, that which is so rigid that children can attach a swing to it.
So this one time I was in the frozen food section and I totally got a Geodude because your grandma was there.
When you insert your cock into your girls mouth and she mudslides it down and then you rock smash her vagina into eternal orgasm that sets her into hospital.
Daz: Obelisk fam you dont know what happened to me dude, I've been at the police station ever since I was geoduding with my girl.
StephanM: Dave bro I want to play fgunz but I've still got a warrant for geoduding with this ugly ass trick.