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A person, usually an ederly female, who takes an extraordinary amount of prescription and/or over-the-counter pills every day. Often they have difficulty keeping track of what they're taking each medicine for.
Cousin 1: "Aunt Sadie sure does take a lot of stuff."

Cousin 2: "Yeah...she takes a different color medicine every half hour. She's a regular Pilly Lilly."
by Turtle Reflex December 04, 2008