2. an exclamation highlighting something you did not know until then
3. a personal reminder
2. "note to self: don't put wooden objects in the dishwasher"
3. "note to self: pay rent"
The phrase is a tongue-in-cheek acknowledgement of our era of Daytimers, Palm Pilots and other personal organizers. It is said as if the speaker was recording his thoughts on tape or some other medium.
So ... interested in dessert?
"Note to self: avoid mentioning that I sleep with a teddy bear tonight."
Taken from the habit of people using a recording device to make notes not directly involved with the subject.
B:"Lousy! I just want to go straight to sleep tonight . . . "
A:"Oh, ok, honey. Note to self: Go and put out the candles in the bedroom."