isgd Share definition Flag 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. isgd by Reg B October 29, 2007 0 0 Get merch Get the isgd mug. Buy Now — $32.95 See more merch