climb up one's thumb en · VERB
Meanings
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(dated, imperative, slang) Go away; get lost; scram.
It didn't sit well with Gerry when the kid told him to 'go climb up his thumb,'" Steve explained.
2012, Phil DeNapoli, Preying on the Innocent, page 47:'Go climb up your thumb,' Galbraith told her, over his shoulder.