Top Definition
Describes a person who repeatedly becomes intimately acquainted with multiple people throughout the course of a summer

Describes a person who has at least one intimate acquaintance over multiple summers
"Amber Mae flies from the northern to the southern hemisphere so she can be summiscuous all year round"

"Mitch would spend his whole year at the gym in preparation for his annual summiscuous behavior"
by Horn Dogs June 23, 2009
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