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Ass-thumbing is when you go to the bar and drink Captain and ginger, and then you strategically place your yourself between 2 people and nonchalantly stick your thumb in someone's butt. The goal is not to get caught and to make the person getting ass-thumbed think it was someone else. Ass-thumbing also goes by " doing the Crosby" Ass- thumbing is believed to be a German tradition, and in the States, there is an ass-thumbing group in the mid coast Maine area.
Hey, let's go out to the Myrtle and do some ass-thumbing.
A person who is a result of one having a thumb up their ass.
Having 'a thumb up your ass' is lazy but the ass thumb is so lazy that their not even doing anything.
Bob didn't do anything the whole week, what an ass thumb.
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when you're so deep in someones ass you no longer have opposable thumbs
bro was so thumb-ass'd he couldnt peel a banana.