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1.
A pungent gas secreted by those exhibiting extreme unlikability.

(Deadly to why-wolves)
No, I don't want to visit Jake and Sue, I'm allergic to obnoxygen.
by WhyWolf December 30, 2010
 
2.
N: (Ub-nocks-uh-gen)

Breathable gas produced by hyper active children
That little bastard is so hyper he's emitting obnoxygen!
by hisrealname September 20, 2010