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(only if you're a boy) When you have sex, you lick both your thumbs and jab them in the woman's vagina continuously. This widens the vagina so it is easier to continue with the sex session. Try multiple times to make vagina wider.
Person 1: "Did you do the DOUBLE THUMB last night?"
Person 2: "Yes, and my girl was hurting the next day."
Person 1: "Sweet!"
by MattJ0hn50n June 21, 2012
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