Unless it's blasting out of a burst PCV hose, a ruptured primary oil separator (part of the oil filter housing), or a split oil cooler seal as above...... I would check the vacuum pump seal. Quite common for that to leak as the O ring is slightly too small and doesn't 'squish' much. VW spec'd the wrong one, imo.
Dry the whole area off with brake cleaner and try and monitor where it's coming from. It should be fairly easy to spot as it looks like it's spraying out quite a lot!