I think “pissed ON” would make more sense here.
I’d say that this is extraordinarily unlikely…unless there is enough condensation to deposit 3-4 oz of water in steam every time they cook, it’s not going to build up…it’ll condense for a few minutes, and evaporate. Unless they’re cooking more or less 24/7, there’s just no way for so much condensate to build up so that it wouldn’t evaporate before the next cooking session. If it was that bad, it would feel like a steam bath every time they cooked! (a real, fully spritzed steam bath from a spa, not hyperbole).
I took apart a (supposedly) waterproof outdoor bulkhead light fitting once - because it was visibly half filled with a straw-coloured liquid. It smelled like fishy piss - but it was just accumulated rainwater and (I think) a mixture of bacterial growth residues, dirt and whatever chemicals might have leached out of the fittings and the brick and mortar wall above (to which the power cable was affixed) - it was filling because it was installed with the cable gland pointing upwards and rainwater was dripping in through the cable gland.
I don’t think there’s any possibility of the liquid actually being urine in my case, due to the placement of the fitting - and my observation that it filled up again over subsequent months following the initial emptying - although it never smelled as bad subsequently, but I think that’s just because I wasn’t letting it sit there as long.
Did the light fixture come from a store that advertises itself as “number one in the business”?
Because I found that it had been done in my house with a bathroom remodeling project. The drain for the shower and sink was about 12’ away from the stack. I had no idea that it didn’t meet code until the kitchen below was redone and the pipes above were exposed. Agree that this would be unlikely in new construction, but remodeling brings out the worst in compromises.
Academic issue, anyway; MrFloppy says that there are no pipes above.