Girl1 has a difficult time pronouncing the "st" sound. When it comes first in a word, she often replaces it with a "d" sound. This has lead to hours of amusement when she tries to say the word "stick."
We went out to eat over the weekend. Dh got a burger that had one of those sticks with the celophane flaggy type things on the top. Girl1 wanted it. Here's the conversation that ensued:
Girl1: May I have your dick?
Dh: No. You always play with it and then you break it.
By that point, I was literally rolling around laughing like crazy.