(noun)Someone who usually is right either because they base what they are saying on knowledge or because their guess is intuitive a normally also right.
"I have to acknowledge that Simon was right again; what a Posti!"
by Ivoryish May 14, 2007
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mullet. Post men grow their hair like this so that their necks don't get sun burnt.
Man, check out the posty on that squiff zeph mother fucker!
by worm September 19, 2003
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british slang for a crazy, insane, or inhibited person.
by Daniel1313 December 23, 2006
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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?
by RUFFSACK May 29, 2023
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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
by Denn1s May 19, 2008
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1. Noun: (most common) nicotine rips mainly after a meal or other receptor priming activity
2. Noun: (less common) any ceremonious use of drugs after an important event
1. That Taco Bell slapped, can I hit your juul to take some posties?
2. that pregame was hype, I have some blow, anyone trying to rip posties?
by Suhdudeyonder July 15, 2021
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