When one doesn't understand, one may react by going, "Eh eh eh.". Depending on how shocked/confused/zombie-like etc. the person is, they may add more length to the "Eh"s.
A phrase deriving from mimicking the beat of the chorus of "Big Pimpin." Pronounced with a soft throaty upside down e sound, one usually pumps there fist (simulating tapping a surface) in rhythm while saying the phrase.
It is used to signify one's dincontent of an unnessary nonprogression.
It is also sometimes used in the direct opposite effect to signify a developing event that could possibly exciting.
When two people argue over the time limit on a trivial pursuit question, the rest of the group would signify their boredom or displeasure by "EH EH EH EHing."