The act of violently inserting your thumb into someones rectum.
Person 1: how did you get that black eye?
Person 2: I ran up behind my girlfriend and gave her a surprise THUMBY.
Person 1: You're pretty stupid aren't you?
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The act of violently inserting your thumb into someones rectum.
person 1: So how did you get that black eye?
Person 2: I ran up on my girlfriend and gave her a surprise THUMBY.
Person 1: Oh that was stupid.
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The Ugandan cum knuckle is a sexual act where during sex you ask your partner if they "Know Da' Wae", and if they do not "Know Da' Wae" you punch them in the face with a fist full of CUM.
She didn't Know Da' Wae, so i gave her the old Ugandan Cum Knuckle.
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