Kind of like yesterday but we don't know what day, just some days ago
My 3 year old doesn't differentiate yesterday, last night, the other day and a couple days ago well so we accept "lasterday" to cover all bases. "Do you remember "lasterday" you let me eat a lot of ice cream?
by Sure Guy April 19, 2019
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Some day in the past that you don’t have a memory of
You. “when did you get the skunk weed
Me. Lasterday
by Kipd October 18, 2018
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Meaning the last time you remembered or the last time you remembered something had happened.

Pronounced “last-er-day”
After somebody had done something wrong a very long time ago they said:
“Oh that happened lasterday

Or when they last remembered something:
Lasterday I had gone with Sarah to the store
by BassChicken21 March 30, 2021
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Past tense. Day before today. Another word for "yesterday" that makes more sense.
Blakely and Lexi went to the store lasterday to pick up the decorations for the party today.
by MommaCC March 19, 2021
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A confused mix of yesterday and last night.
History teacher: I graded my papers lasterday
English teacher: that’s not a word
Coach who looks the word up on Urban dictionary: it’s a word
by *insert ur mum joke here* January 7, 2020
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