Aunt Judy
An Aunt Judy is a mature, often pudgy woman, possibly a relative but usually a family friend, who you know personally and might consider screwing under the right circumstances. Blind drunkenness, complete darkness and total secrecy are some requirements that probably spring to mind as you study your beloved Aunt Gladys and imagine what could be lurking under that 45 year-old dress. The term "Aunt Judy" probably originated in connection with a defunct pornographic web site of the same name that featured all-nude and really unattractive grannies.
An Aunt Judy is like a MILF or Cougar but very familiar to you, usually older and far less attractive. You wouldn't but you can't help thinking about that old tang and hating yourself for it.