Specialist in Urinanalysis

John K. snapped PICUP MN. At first glance I see "Pickup Man," either referring to this man's love of trucks or the "art" of picking up women. Upon further staring, however, I see "Pick up men," which, you see, is probably the exact opposite of what this guy is trying to convey. Or how about:

Pee! I see you pee, man!