Sly puppy Share definition Flag A person who is just beggining to be sneaky,devious,lucky,slippery, etc. and will eventually be a "sly dog". Gabe: That new kid is trying to steal Austin's wallet. Channy: He is such a sly puppy. Sly puppy by ▒☺♫ May 6, 2009 0 0 Get merch Get the Sly puppy mug. Buy Now — $32.95 See more merch
