a locution meant to express an indifferent attitude or ambivalence. A phrase often adopted by "fence-sitters" or people who are otherwise hesitant to take a position on some matter.
Note: Can also be spelled "eeaahh" or "eeeaaahhh" (the extra letters indicating greater indifference). In extreme cases of indifference, one can add a "bl" in front of "eah", forming the phrase "bleah" (although this phrase is less common).
Note 2: the pitch in which this phrase is uttered can also indicate a greater or lesser degree of ambivalance (higher pitch indicating more ambivalence; lower pitch indicating less ambivalence)
J says: "Which tuxedo do you want to rent for the formal?"
M says: "Eeeeaaaahhhh..."
J says: "C'mon you droopy-faced fence-sitter, you need to pick a bastedo
R says: "How ya doin' Marty?"
M replies: "Eah ... pretty good... pretty good."
R says: "You're lookin a bit akimo
M replies: "Bleeaahh..."
R say: "Don't worry, I got a touch of the akimo