Merghhh: A term of expression used to...
a) Scare someone after tapping them on shoulder
b) Show a certain level of uncomfort
c) Show interest
Examples:

a)... *Jeff creeps up behind Sam*
Sam: "Huh, WHAT THE!"...
Jeff: MERGHHH!

b) Barry: Sup Dan?
Dan: MERGHH! My parents invited Mr. Palmer for dinner!

c) James: OMG! MILF ALERT
Kevin: Where, Where!?
James: Dude quick, at 12 O' Clock!
Kevin: OH...;) MERGHH!
by Arjun_11s May 2, 2006
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