Top Definition
A half sibling via your father

ie from his 'spunk donation'

usually applying to promiscuous men with more than one family.
I didn't know you had a brother/sister - Oh he's my "Spunk Brother / Sister"

Underlining the fact that the relationship is not a close one.
by Big Superfuzz April 02, 2009
5 Words related to Spunk Brother / Sister

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