What’s “the morning drip”?

I was playing red dead redemption. And during this mission, john told jack he was sick in a way after jack had asked him how he met bonnie mcfarlene. Then jack asked,”was it a gentlemen’s? What do they call it? The morning drip?” to which john replies,”Good god boy, who told you about that?” And jack tells him uncle told him. Then john calls uncle a dirty old fool.

The Morning Drip refers to a grayish-white drop of mucous discharge from the urethra, usually symptomatic of a gonorrheal infection. The phrase can also be used to refer to the infection itself.