When one human ejaculates into another humans throat, but some of the human precum gets caught on the uvala, and the receiving human must cough to remove the blob of cum to continue giving oral pleasure.
Female 1: "Ash's pre-cum got caught on my uvala last night and i had to cough to dislodge it!"
Female 2: "OMG, Melissa, that is super gross don't tell me about your weekly cum coughs"