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A hip portmanteau for Step-Uncle. Also applicable to any other step-relatives, i.e. Stousin, stister, Stad, ...etc.
My Step-Dad's brother cooked dinner last night, we call him Stuncle Albert.

My Stuncle be actin all dumb n stuff.

Me and Stuncle Craig drank 40's and watched the Winter Olympics last night.
by StuncleBuck December 28, 2012
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2
Step-uncle
I thought steve was my cousin but heโ€™s actually my stuncle
by Big black al November 23, 2017
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