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1.
To be wrong in the head, with an unhealthy obsession with Bananrama and web forums.
I.E. randomly in the middle of a conversation saying Bananarama....."They're a good band arn't they" would probably class you as Poostix.
by John May 06, 2005
 
2.
i feel like shit. Or can be used to say something is shitty "poosickish"
exapmle 1: i feel poo stix :(

example 2: that movie was poostickish
by lord_almighty May 25, 2008