since i'm dutch i can shed some light.
she is making an item on the "festival life" and goes to check out of clean the toilets are.
she comes at the urinal, pis bak in rude (ie standart speaking) dutch, and sees that its clogged because some ppl dumped their plastic cups in it.
She is just joking that you could fill one of the cups and sell it as beer (since its all yellow and fomey) when the american guy comes out and washes his hands in it.
upon understanding what he did in front of the camera the guy goes back in to the portotoilet where it important to know that in there there is no place to wash your hands either (thats always, to actualy prevent people to piss in it when there is an line, a bit further away from the toilets at the exit of the toilet area)