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The act of using ones hand to gently cup another's genitalia, while diddling said genitalia with the fingers, with a focused effort by the middle finger. Can also be used as a verb, and is effective for both men and women.
"I thought she was going to jerk me off, but instead she gave me the ole undercuffler."

"I was so shocked, I thought he was going to kiss me but he undercufflered me!"
by I201 June 18, 2017
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