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Unofficial replacement for yesterday. Such as referring to the night before as lastnight, the day before is lastday.
I know lastday was Friday because I receive my paltry paycheck on Fridays.

I partied so much lastday that I don't even remember sleeping with my roommates girlfriend lastnight.
Lastday by Emencee February 4, 2008
Related Words

post-LOSTdom depression 

the incredible sinking feeling leading up to and devastating depression following the finale of the hit TV show LOST, leaving you fulfilled knowing it's over, yet so very empty, because, well, it's over.
Person 1: I'm kind of concerned about Adam today...do you know what's wrong?
Person 2: Do YOU know that LOST ended last night so that's why he's locked himself in his room, turned off the lights, and continues to say the numbers as he cries himself to sleep?
Person 3: Oh yeah, my doctor warned me about post-LOSTdom depression... I told him not to worry because I watch Grey's Anatomy and that makes me cry all the time. So then I said he should probably worry about that...

Person 1: You should probably not ask Janell to do much today. Or Kim. Or Shawna. Or Andy. Or. Terry. Or any LOST fan for that matter. They're suffering from post-LOSTdom depression.
Person 2: Maybe they could just start watching House...?
Person 1: Shut your face. You really don't get it. They practically lived on that island.

lostdotmind 

Lostdotmind make better song then nineflare
lostdotmind by Pokkeeeee June 12, 2019
“Let me see that dick”

Acronym used by aggressive females or bros
Yo JC addict LMSTD
LMSTD by Uncanney January 9, 2020
Late night sex talks, talking to someone on how much you wanna fuck them or just sex in general late at night
Abby and Jack always have LNST and I get jealous because of it.
LNST by yogirlz17 November 25, 2020
Let me search the docs for you
noob: How do I do I add 2FA to a laravel project?

expert: LMSTDFY <url>
LMSTDFY by dmason30 July 24, 2022