Dry Walrus 

The act of having sex with an old, fat, wrinkly, dry vagina. Most often referring to an old woman; grandma status. The opposite of a cougar. Level of intoxication required for a dry walrus is extremely high.

"There are so many fat, gross women here the chance of any of us getting laid tonight is pretty much zero"
"Well unless you want to settle for a dry walrus"

Dry Walrus by Ziggy Stardust2 January 1, 2012