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The figurative act of sucking one thumb while the other is in your asshole, then reversing or "switching" their places, over and over and again.

Used to describe a lazy person, doing nothing all day.
Grandpa Joe: Now listen here Jimmy, we gotta have them cows milked and that fence painted by suppertime. So don't be settin' around all day switching thumbs.

Jimmy: Yes, sir.
by Hilda's Grand May 31, 2011
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