physically it's a semi-erect penis - as in half way there. A semi-erect penis is good for nothing. Hoobai is the term used to describe a semi-erect penis and is also used to describe someone or something that is good for nothing.
He's a fucking hoobai.
You're a hoobai
I was so hoobai'd last night that I couldn't seal the deal.
by JakeRue May 24, 2007
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