What is Pnooma?
1.
Abbreviation:
Pulling Numbers Out Of My Ass
(see also: 
To support one's arguments with arbitrary numbers that may or may not seem plausible.
Professionals (i.e. people who get paid for making PNOOMA-statements) prefer to use terms akin to "Qualified Estimate" or "Economic Calculus/Forecast" instead.
"This is completely PNOOMA, but about five million people in China miss both their front teeth."
A:"<statement involving statistics>"
B:"I don't believe this. It seems like PNOOMA to me."
See 
Random Words:
1. 
1) The creator of the largest GameFAQs topic ever made, a 4145-post topic proclaiming that every 20th poster would recieve $10 by PayPal..