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1 definition by MrBigDef

 
1.
Originating from the Gangstarr song "Moment of Truth" a Dennehy moment is a point in time when you or your associates realize the girl you hooked up with is grotesque/ugly.
When I remembered that Rosie O'Donnell gave me a handjob last night, I knew it would be a Dennehy moment for the rest of my life.
After I heard Ian McCulloch, the famous DJ, hooed up with Amy Poehler at Lindsay Lohan's condo, I knew it would be a Dennehy moment for the rest of his life.
by MrBigDef March 30, 2009