Grampdad Share definition Flag When you are old as fuck, and about to have a baby, at the same time your kid is also having a baby. You sir, are a Grampdad. My kid is having a baby! So am I! I'm a Grampdad! Grampdad by WesTek May 22, 2020 0 0 Get merch Get the Grampdad mug. Buy Now — $32.95 See more merch