"person 1: "did you do the double thumb last night?" person 2: "yes, and my girl was hurting the next day
(only if you're a boy) when you have sex, you lick both your thumbs and jab them in the woman's vagina continuously
""person 1: "did you do the double thumb last night?" person 2: "yes, and my girl was hurting the next day" What is the definition of "double thumb"?