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1.
1.A dramatic way of expressing making a large mess.
for example; "I just messiated all over myself"

2. A referal to dirt or "mess".

3.Originated in bradford; youth slang.

Blend from the words "mess" and "averted"

But with an Antonym meaning.
Guys Mac just messiated all over the snuggie.
by Laur:) June 17, 2010