coccydynia 

A pain in the butt

Every guy is such a coccydynia at some point

coccydynia by You're welcome hoes April 5, 2016

coccydyniac 

It refers to a person who is a big pain in the butt

"She's such a coccydyniac, laughs for nothing at all and expects us to laugh at her comments too..somebody save me please."

coccydyniac by D.i.V.i. May 4, 2009