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In academic circles, a noun for someone who engages in post-structuralist, post-modern or post-colonial research. Also can be used as an adjective to describe anything relating to this research. Generally used somewhat pejoratively.
That new researcher is working on subalternality in Italian refugee policy. She's a total postie.

So are you going to the postie conference? I hear that they're giving presentations on Agamben and Derrida.
postie by homo_sacer September 13, 2010
Post work drinks. Usually occuring immediately following the commencement of a mundane office job. pl. posties
Friday night lets meet at the pub accross the street from the office for a couple of posties.
postie by T-Bombs September 2, 2005
A "post" bachelor party. A bachelor party for the guy AFTER he gets married, usually involving bars, drinking, strip clubs, strippers, etc. The wife may or may not be informed of the event. Occurs when the groom has eloped with the bride or has got married far from his friends. When he returns, the postie is thrown in his honour.
Have you seen Peter today?

No way, his buddies threw him a Postie last night and now he's sleeping off the hangover. His wife is furious!
Postie by Predro April 29, 2010
An appallingly bad golfer that loses it completely because their crap game is talked about.
Don't mention the triple bogey to that guy. He is a complete Postie
Postie by Denn1s May 19, 2008
A derogatory term for someone born post-9/11. Mainly attributed to American members of Gen Z and Gen Alpha.
What would you even know about it? You're a damn postie.
Postie by Madison W September 10, 2023

Postie Roulette 

After downing a 1.25 litre of coke and a large pizza while playing RuneScape 3 men blow their loads into a shot glass each.

The shot glasses then go into the microwave for 30 secs and they randomly select a shot each.
They then yell “MEALIE” then skull the random shot
Hey Greg want to play POSTIE ROULETTE with me and Wayne tonight?
Postie Roulette by RUFFSACK May 28, 2023