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A small, cute little hiccup. A hiccup that makes a squeaky little sound, usually under the breath. Usually caused by a girl trying to stifle a real hiccup. Sounds very funny when heard in rapid succession from a girl...kinda like a little squeaky-toy!
"Her hiccups are small and cute...you know, higgies."

"Heidi is cute when she hiccups a higgi!"

"Oops, I feel a higgi coming on..."

Another version of the word hickey, possibly?
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