First dragon your character slew.
We were on a mission for some druids to collect items from ruins to save the world or something like that. A red dragon guarded an item so we got a bucket of lard sprinkled spices on the lard bundled it up and put in a bottle of poison. We offered it up to the dragon as a baby in order to allow us into the ruin. The poison made the dragon sick enough for us to grab the item and flee through the druids portal. The dragon did not make its saves and died.
I think we called the dragon Lard-baby-eater.