Usually a term used when the person has tried so hard to forget
something and someone else (usually a friend) states the obvious in order to jog your
memory in
case you have (luckily) forgotten such a bad event/memory.
*
Girl is hopelessly in love with a guy named, hmm, Stephen*
Girl: "Huh, look at that angel over there, I have been crushing on him since 6th grade. It isn't a crush anymore, I think I truely love him.
Girl's friend: Umm, he goes out with a-MAN-duh. (amanda)
Girl: Ugh, Don't remind me.