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.
Penny: Really, when was that?
Amber: Lasterday, I think.
by DeedleDawn October 07, 2009

by Teatime777 December 28, 2015

by Angelpie November 27, 2012

I smashed on this beezy lasterday.
by Antdizzle310 June 17, 2013

by Ded Jezter June 04, 2016

by ShadowCaster07 May 09, 2011

by keywestgrl January 21, 2013
