My son just turned two last month, and he’s starting to speak in sentences. He also asks anyone nearby to “Kiss it” when he gets hurt, then happily goes on about his business.
So my wife tells me that his latest thing is when she spanks him, he tells her to “Kiss it Mommy!”
Needless to say, I found this quite hilarious, however, YMMV.
It’s really very sweet, but you might want to be a little careful about the “anyone nearby to kiss it” bit.
LOL when my neice was little, she couldn’t say her “l” sound. And instead of “kiss it” she would say “yick it” ROFLOL.
Now THAT I would be worried about if she said that anywhere else.
My other neice (my sister has six girls), the first born, loved candy. My sister tried to keep it from her but she found it one day and ate some w/o anyone knowing. She was about 18 months or so. She called it “nyah nyah.” One day she was in my sister’s bedroom and she’s hollering loudly “nyah nyah” over and over because she couldn’t reach it on their head board. Finally the hollering stopped and my sister became concerned lol.
She walks in there to find her dd on the bed holding a condom LOL saying satifsfyingly “nyah nyah”
She screamed bloody murder when my sister said “no nyah nyah”
LOL
I had a friend at my old job whose daughter had a bad speech problem when she was very young.
She loved to ride in her Daddy’s truck with him and she thought it was a very big truck.
Imagine my friend’s horror when the little girl started annoucing to everybody about how her Daddy’s f*ck was really big…
She worked really hard with her and the speech therapist on those F and T sounds. 
My son was in speech therapy since he was 3 (he’s 11 now and just recently stopped last year).
I remember when my brother was little, he couldn’t say truck either … he would say “fruck” lol
My baby brother coulndt say “truck” either. Being the evil big sister I was, I used to sit on the stairs and practice saying f*uck with him.
When my boys were little I used to tickle them till they said “mommy is omnipotent,” (yeah, I know, psychological damage ensues.) Anyway, my youngest couldn’t quite get his mouth around that word and it would come out as “impotent” occasionally. This wasn’t a big deal until my ex was tickling him and he screamed “daddy is impotent!” I just looked at my ex and said, “well, I didn’t tell him.”