When a bunch of dudes are together at a strip club or a party when they want ass but no chicks. A bunch of guys that get boners together but not because of each other but because of the lack of pussy and the need to hit it.
(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!'