A perpetually smiling and optimistic person.
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(dated, rare, slang) A smiling face.
The students walked down the hallway, their gigglemugs showing their excitement.
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A person who deceitfully behaves in a happy manner.
He was quite a gigglemug and brightened the dull Monday.
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Regional slang from around the English-speaking world — British, Australian, Irish, Caribbean, Nigerian, Filipino, AAVE, and the hyphenated-English dialects that make the internet sound local.
See all Regional & Other slang on Slangora.