acha

Short for "Right acha" which in turn is short for "Right at you." This means "I feel the same way."

Alice: I really hate it when Don goes on and on about his problems with his girlfriend.

Bob: "Acha."

See gotcha

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orthogonal

Used to describe two things that are independent of each other. One does not imply the other.

Common sense and intelligence are orthogonal. I've seen plenty of smart people with no common sense.

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