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2. In the attic
To be high or stoned on any sort of drugs.
To be in the attic, up in a place where normal people aren't are, the highest part of a house.

"Man, I was in the attic last night, and my mom found out!"
1. In the attic
Said of a jew who hides or is generally ashamed of his heritage.
My friend Dan is totally in the attic. He never tells anyone he's Jewish, and the guy's middle name is Abraham for god's sake...