Otaku slang for a deeply and broadly perverse individual, who enjoys a sexual response to essentially all sexual stimuli, fetishes, complexes, etc. From the latin "omni" meaning "all" and "con," a Japanese corruption of "complex."
"He's more than a lolicon, he's a full-on omnicon. He'll fap to anything."
by stuart slade February 17, 2013

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Top Definition
Someone who can go from being a nice person into a deceptive opportunist with in nano seconds. One minute they are your best friend, the next they are walking off with the copyright draft of your first novel.

You never know someone is an omnicon beause they are deceptivley friendly and decisive in their plans. An omnicon could very well be classed as a visionary but due to their criminally minded behaviour and outlook, they are never referred to by anything less than opportunist.
How did your house painting go?
well it didnt really, the tradesman turned out to be an "omnicon", i came home to find to find the place emptied out.
by VICKI KARMA November 10, 2006

The Urban Dictionary Mug

Lotsa space for your liquids.

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The Urban Dictionary Mug

Lotsa space for your liquids.

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The Urban Dictionary Mug

Your favorite word on a white mug.

Create a mug

The Urban Dictionary Mug

One side has the word, one side has the definition. Microwave and dishwasher safe. Lotsa space for your liquids.

Buy the mug

The Urban Dictionary T-Shirt

Soft and offensive. Just like you.

Buy the t-shirt

The Urban Dictionary T-Shirt

Smooth, soft, slim fit American Apparel shirt. Custom printed. 100% fine jersey cotton, except for heather grey (90% cotton).

Buy the t-shirt