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Sperm donor who takes the role of an extended family member in the resulting offspring's life.
There were four adults who took the kid to see the pediatrician -- two parents, a grandparent and the spuncle.
by family boy September 27, 2008
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2
When a mom/daughter team marries two brothers...the wife's hubby is her spouse and uncle. Ergo, 'spuncle'

Take that, MB!
'I love you, my little spuncle'
by ShoeGirl119 August 30, 2011
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