The female version of a man's "Spank Bank". A "Spank Bank" is a list compiled by the spanker who he uses to visualize during his self pleasure sessions. When a women is ready for some alone time she'll go to her "Diddler's List" while she is diddling herself.
Example No. 1:
Sally Mae woke up horny one morning and started diddling herself. She went to her "Diddler's List" and thought of the muscular trashman she saw earlier in the week.
Example No. 2:
Sally Mae was watching the movie "The Princess Bride" and her clit started to throb at the site of "Andre the Giant". She instantly added him to her "Diddler's List".