(NSFW) What can be the liquid coming out of an uncircumcised genital?

I gave my first handjob recently, and the man showed me how to do it since I was doing it wrong, pushing the skin high each time. He showed me a light yellow-brown liquid squirting out of his assumedly pee-hole when he pulled the skin very high and said to not do that. He told me he doesn’t have any diseases prior to these events. Yet I am very confused about the whole thing, I can’t talk to him till next week since he is on vacation. Please help?

PS: The strange part is that he showed it to me, doing it with his hands and told me “I guess you never saw been with an uncut before” as if this was a perfectly normal thing?