The word you use when you are talking about something that happened in the recent past, but you can't remember the exact day (due to a black out), or it really doesn't have any significance to the story...or you just can't be bothered to think hard enough to remember it.
Amber: I just went to a Ween concert in Anaheim.
Penny: Really, when was that?
Amber: Lasterday, I think.
by DeedleDawn October 7, 2009
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Today is tuesday, which means Sunday was Lasterday.
by Teatime777 October 29, 2015
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Remember lasterday, when you were born and then started driving.
by Angelpie November 20, 2012
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When you don't remember what happened LAST night but knew it was YESTERDAY.
by Antdizzle310 June 18, 2013
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Lasterday is the day before yesterday, two days ago.
We got home yesterday, but we only left lasterday, so it was a quick trip.
by Ded Jezter April 20, 2016
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Sorry I missed play rehearsal lasterday, I had so much homework!
by ShadowCaster07 April 19, 2011
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