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1.
OOMBAT pronunciation (oom-bot)

meaning: is an insult to a person who is being a "know it all", but does not know much about anything, Pompus, arrogant, fool
He is an Oombat!
by Heather Broomy October 28, 2009
 
2.
Half-man Half robot
oumbot

YOu are being an oombat

look at that oombat
by Hefer October 30, 2009