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1.
ISGD! An abbreviation of the phrase I said good day. Used

to punctuate lengthy diatribes of an often political, albeit nonsensical nature, posted on social networking sites.
Barack Obama rlz! You don't like hm cuz ur a racist. End of discussion. ISGD! i said good day!

There will be no more talk on this issue, I am opened minded! ISGD!
by whohitya November 23, 2010
 
2.
Short form of "I Said God Damn". Used to replace things like "Fuck Ya" and "Come to Mama."
After Tom exhaled a massive toke from his bong yelled, "I said God Damn." and typed isgd into his messenger chat box, to state his satisfaction to his friend.
by Reg B October 14, 2007