Someone who collects pictures of beavers. Actual beavers or just vajayjays, pums, minge. And hoards them, like a wank bank, if you will.
They arrange the beaver pictures in chronological order and perfume them with pot pourri scents.
The 'beaver-goblin' is a Duckerism.
'Oli, what's in that box?'
'Mmm, smells good'
'Mate, you're a beaver-goblin''
'So's your mum'
- Beaver Goblin