It is a Dirty Sanchez, but instead of a mustache, you give the person a unibrow with your shit covered dick.
To spice things up, Bill gave Terry a dirty griffin instead of the usual dirty sanchez.
by thejohnwagon April 7, 2011
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A 'dirty griffin' is when a guy is fucking a pregnant lady and claims to have had a threesome.
"Did you hear that guy had a dirty griffin"

"Yeah, it was his mates mum too"
by GrilfOfHampton October 2, 2018
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