(n.) a legendary venue located in San Francisco's Lower Pacific Heights district known widely among San Franciscan's as the contemporary go-to spot for wildly exotic and scintillating social gatherings.
The Post-Haste has hosted crowd-pleasing events such as the South of the Border Occupation Celebration, Roll up a Phatty - Sushi, Wrath of the Renaissance, Rubies and Ruphies, Live 3 or Die, and 80's for Adam.

"Hey are you going to prom at The Post-Haste this Saturday?"

"Oh hell ya, I'm going to roll up out the cut around 11 and do the Macarena until my eyes bleed."
by Teddie Franklin Smallinsky III September 8, 2006
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Immediately. ASAP, or as fast as you can.
1)I have to finish this report Post-Haste!
2)I'm famished, someone give me food Post-Haste!
by Will Radford December 13, 2005
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The act of posting an image or text too quickly onto social media before it has been properly edited, resulting in errors such as misspellings, poor grammar, or improper abbreviations which can lead to feelings of remorse or regret in the person making the post.
Mary regretted her Post-Haste Post to Facebook of her husband Morty pictured at their 20th anniversary party with him holding a can of Coke in one hand and a piece of cake in the other which she inadvertently captioned, "Everything goes better with Cock"!
by Jetta101 February 22, 2014
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