peppermint stiffy

When a girl puts a peppermint into her mouth when she is giving a man a blow job. The minty coolness causes extreme pleasure and gives the man what is called a "peppermint stiffy."

Bobby- "Guess what happened last night."
Jim-Bob- "What?"
Bobby- "Cheryl gave me a peppermint stiffy."
Jim-Bob "NO WAY! Was it awesome?"
Bobby- "Yah man, it was filled with minty pleasure."