A call in any childrens game, such as jacks, where one action must be performed.(noun)
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Use "onesies" in a sentence
"Using lactose intolerance to sell onesies is pure pig ignorant fear-mongering."
"Not what the military refers to as the onesies and twosies, but the big one to try to create enough chaos in the lead to civil war before turnover of sovereignty on June 30."
"On the other hand, it's very clear now that we're down to what I would call onesies and twosies in the American defense industry, meaning, we have one maker left of the most capable and sophisticated machine tools in this country, one manufacturer."