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1.
Acronym: Get out of my Head!

Used when two people simultaneously say or think the same thing. Often used as instant messenger shorthand.
(Completely random chat-excerpt)

Me: We should get pizza.
You: Pizza sounds good tonight.
Me: GOOMH
by dare2dreamer April 29, 2010
 
2.
An exclamation given when someone is banishing a visitor from their presence due to an unlawful act. GOOMH stands for "Get out of my house" but can also be used on social networking sites when someone is offended or surprised by something.
Ross: Hi Jacob, I came to your house to steal your TV. Is that okay?

Jacob: What blasphemy? Get Out of My House! (GOOMH!)
by Jarosscob February 16, 2010