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1.
In internetspeak, the onomatopoeic pronunciation of the acronym ISHYGDDT, or "I Sure Hope You Guys Don't Do This." Often appears in internet forums and other online communities, uttered by the user to mock something another individual has done as being overtly stupid or outdated in some way.
Poster1:

"Hey everyone, check it out! I just got my new Macbook Pro!"

Poster2:

>$2500 facebook machine
>2012
ISHIGGYDIGGY"
by Pack Sniffer May 12, 2012