A typographical error made while using thumbs only to text mesage. Similar to a typo, or typographical error.
Did you mean to write guck you? No, sorry, that was a thumbo.
po The Pigfarmer's Grandson Октобар 3, 2009
1 more definition
Refers to a clumsy person with a distinct lack of coordination with his hands.
He's such a thumbo, he cant catch a pass to save his ass.
po upriverman Март 2, 2004