A little sip; less than a cup of some particular drink(noun)
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Use "sippy" in a sentence
"MR: And shouldn't we retire the term "sippy cup" by now?"
"Of the juices and other beverages, yes, even of those in sippy-cups, you may drink, but not in the living room, neither may you carry such therein."
"As I’ve said more than a few times, the whole problem is this: women/moms blog, and make money off of blogging, and outlets like the Times publish light trend pieces about it, pieces that draw attention to mimosas in sippy cups and make comparisons to slumber parties."