Slang for a anal penetration using one's tongue to "mine" for "gold" (I'll let you guess what that means). The practice is commonly done between heterosexual men, but can be done between both sexes.
Guy #1: "Dude, Me and Guy #3 were mining for gold last night." Guy #2: "Ew... wtf." Guy #3: "Bro, my cavern is completely empty now." Guy #2: "Omfg..."
Booze mining is the practice of hiding a quantity of alcohol (and/or drugs) before the security goes up for an outdoor festival (say, like Lollapalooza) by burying it on the grounds, often with a geotag on the location, and digging it up after the show starts.
"What're you doing there?"
~ "I'm digging up my booze, man!"
"Dude, I so thought booze mining was an Urban Legend!"
Realizing at some point during or after intercourse that your condom has ejected itself and is now, through repeated ram-rodding, nested itself as far into her vagina as possible, you have no choice but to do the gentlemanly thing and retrieve it -'through whatever means necessary'.
Loser: "What'd you do last night?"
Stud: "I was knocking the back out of Sheila's vaj. When I finally pulled out after a good 30 to 45 seconds of awesome lovemaking, I realized my Magnum had abondoned ship. I was wrist deep in her coochie doing some series condom mining. Bitch owes me big time!"