When you've had too much to drink and you're stood up, taking a piss (where ever that may be) and suddenly you feel like throwing up, and do so while looking directly down.
John: "You guys won't believe what happened to me last night. I had so much to drink that I couldn't even hold it in while taking a piss."
Dave: "Sounds like you had a serious case of vomit cock."
Dave: "Sounds like you had a serious case of vomit cock."
by [Chaz] December 16, 2008
When you are being deepthroated too hard they choke and throw up onto your dick. Making your cock reek of vomit for days.
by BirdShitter January 7, 2016