A humorous out-loud reminder/aside meant to indicate your future plans or a lesson you have just learned, dependent on the disparity between one's actions and one's inner thoughts. Originated with Norm McDonald's into-the-mini-cassette-recorder bits between jokes on Saturday Night Live.
(Several hot girls walk into the room, past a frat guy and his friends.)
"Note to self: avoid mentioning that I sleep with a teddy bear tonight."
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