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1.
eah
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 to me."
M replies: "Bleeaahh..."
R say: "Don't worry, I got a touch of the akimo myself."
by fifteen minutes September 08, 2004
 
2.
eah
When something is sexy
That guy over there is cute! EAH!
by Anonymous November 05, 2003
 
3.
eah
Yeah without the Y.
someone: "sup marty"
Marty McFly: "eah mate, eah"
by esh ladz October 23, 2009