Along the lines of booty toot, when Henry farts I call him Henry Tooter and laugh at my own cleverness every single time. DH quit being amused about 12.5 months ago out of the 13 months since DS was born.
Eddy, for a long time I was mama, but so were their horses and it also meant "I am very sad right now." The horse thing drove me nuts. One time one of them ran up to the horse MAMA MAMA MAMA and gave it a kiss :-\
I tell E to "pull up your britches because your buttcrack is showing." about once a day.
We call Freddie's pacifier his paci because he calls it that.
I say jammies, jammers, jams, and jam-jams.
We say poop, fart, and pee and we call most body parts by their proper names, except Freddie calls his penis his mee-nah, so we all pretty much say that now.
Not necessarily annoying, but thinking back to when I was little, my parent's called farts "floofs" and poop "big job." Do you need to go big job? LOL. I now realize that is weird and funny.