thumbo
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.
thumbo
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.
thumbo
Typo's created with your thumb while writing on a mobile device.
I was tired, typing so fast on that slick mobile gadget that the text was probably so full of thumbo's as to become completely inelligible.