1. Cao Down (Pronounced "Chow Down")
-To eat a girl out after meeting her only one hour before.
1. Informal. (A backformation of Cao Down) To eat out a girl as the first form of intercourse. Esp. if you don't know her very well.
Origin: 2007; late Frat English: Cao Down => Middle English: Chao Downin => Old English: Sowdawnen, lit. "Let me put my mouth on that girl's privates, though I'm fully aware that she may be full of disease" from Sow- "Let me put my mouth on that girl's privates" and -dawnen "I'm fully aware that she may be full of disease"
Person 2: "Yeah, but he did it in someone else's bed and thus got beer dumped all over himself..."
Person 1: "Still, dude, still..."
Person 3: "Actually, that's kinda gross."
Person 1: "Yeah, actually it is, I'm sorry I brought it up."
Person 3: "No, it's cool..."