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A set of saggy, dangly, sweaty balls/testicles. Primarily due to heat.

They are the opposite of Winter Onions which are a set of balls that are shriveled in a taut scrotum. Primarily due to the cold.
I was just scratching my summer Onions and now my fingers smell like pickled onions and sour cheese.
via giphy
by Eaton Holgoode May 23, 2018
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