When one sprays and blankets (fully or partially) another with their own reproductive fluids, typically follows a deed such as sex or oral sex, but is not limited here. Paint Jobs are gender-neutral.
"Hey man, you should have seen the Paint Job I gave this girl who was passed out in the quad"
"My new girlfriend isn't on the pill, so I'm giving her quality Paint Jobs every night"
"Trashell, Eugene flicked my bean so professionally last night I gave his face a serious Paint Job. Before he could even do it again I gave his face a second coat!"