An exclamation of surprise, pleasure or anger. Can also be used as a greeting irl as well as an acceptable way to start a Facebook conversation
"Shiggy diggy doo-dah whats up my nigga?"

(eyeing some fine ass)

"Shiggy diggy!"
by pewsham_mafia February 27, 2014
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Originally starting as the acronym ISHYGDDT (I sure hope you guys don't do this) on 4chan, the acronym was later extended to 'Shiggy Diggy Doo'. When the term first came into use, many newfags thought it was also an acronym, so it was often said as 'I SHIGGY DIGGY', which was implied as an acronym for 'I sure hope I go get young dogs in good gay yelps', which was a reference to the massive amount of furry pornography that flooded the site during that time. Even today, the phrase is in use on many mainstream internet sites such as 4chan, reddit, tumblr, digg, funnyjunk, and facepunch.
Guy 1: Hey dude, I just bought myself a pack of ciggs. Want one?

Guy 2:
>Any year
>Not smoking weed instead of pleb-tier cigarettes
>Shiggy diggy doo
by Shiggy diggy doo November 20, 2012
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The action of sprinting towards your target and drop-kicking them.
I swear to god, I'm going to shiggy-diggy you in the fucking chest.
by anon10938 July 10, 2017
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you walk into a bar and see one of your homies, and you say...

"Yo, shiggy my diggy!"
by Shiggy My Diggy October 9, 2012
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