(adj) when something is so buttspankingly good that everyone experiences a boner and/or an orgasm, metaphorically speaking.
Of course, a very good thing can be orgasmic, bonertastic or simply boneriffic, but for the full 10020% of awesomefulness, bonergasmic does the job. Used extensively by teens in Northcote and Preston.
'wow, this ice-cream is bonergasmic'
'how was school?'
'boner(pause)gasmic! The maths teacher was sick and we got to watch dvds all day'
'sick!'
The feeling of relaxation when laying down on a bed and you feel all your bones just absolutely melt, releasing all the tension in your body. Sometimes accompanied by moaning really loudly out of comfort
After coming back from work, I literally had the biggest bonegasm as soon as I got into bed