n. a stomachache. : Oh, mama, do I have a bellyache!
in. to complain. : You are always bellyaching!
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition. Copyright 2007. Published by McGraw Hill.
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Medical Dictionary
Main Entry: bel·ly·ache Pronunciation: 'bel-E-"Ak Function: noun : pain in the abdomen and especially in the bowels :COLIC