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Latin word that means "The same", seldom used nowadays.
In a conversation, when used, it can mean:

Same here-
Me too-
I agree with what u have just said-

The adjective "Idemer" is a neologism to describe a person that copycats other people.
Jinzo: Yesterday I saw Andrew hanging out with his girlfriend.
Nelson: Idem, I was with my girlfriend too.
Jinzo: Nelson, you are an idemer...
Nelson: But I wasn't chilling with my girlfrend cause I saw Andrew doing it.
Jinzo: Meh.
by Kenjitheninja January 07, 2007