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Same as english usage "suppose to"
I was posta go to school today but I didn't.
posta by Jungle March 18, 2003
An abbreviation of the word suppose, something you should do or you are suppose to do.
you are posta stop at da red light
posta by Christine Smith August 10, 2005
Place where its chill for smoking marijuana
Boy meet me at the posta by the park
Posta by BsikerG June 15, 2019
A word in place of “supposed to” when you don’t feel like saying the whole thing
I’m posta pay deshaun back later today.
Posta by BJK42 December 15, 2017
"Hey, Tony, you're not 'posta be smoking in the house!"
'posta by Laura Messer May 7, 2008

Posta B. 

1) "Supposed to be"
2) "Poster Boy" -- A person who is an example of something
3) "Poster" -- In regards to basketball terms.
4) A Rapper from La Puente, CA
1st Person: Eyo did you hear Posta B.'s new track?
2nd Person: Yeah man that ish was fire!
Posta B. by PB9 December 4, 2007