Oooh, interesting topic! ;) Well, we have a couple words...

Fafaset - Butterfly. When I was a toddler, I called butterflies 'fafasets', and sometimes we still call them that.

Come-es-hier - A twisted mess of English and Dutch, meaning 'come here'. Pretty much only used to address our terrier, who was bred and born in Holland.

Pasketters - Spaghetti. I'm pretty much the only one who says this, although my whole family knows what I mean when I say it.

There are a lot of other words we use that are pure Dutch, but since we didn't make them up, I'll not include them here.

Sosi"I know as soon as I post this, I'll think of more words"qui