Urban Dictionary: Thumb up your ass - Thumb up your butt
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Pls note it can be 'thumb up my/your/his/hers/possessive pronoun's ass" as needed. I just put "your" in the entry title because it's the most common. Doing nothing. What have you been doing all day? Sitting around with your thumb up your ass? #thumb#ass#doing#nothing#bored. by brando November.