thumbo
n. An error made while using the thumbs to type, particularly on a mobile device keypad.
Etymology
Examples
2010
How do you get rid of "thumbos," those cellphone message typos? Practice. And some handy tips.
—“Touch Type With Your Thumbs,” One News Page, March 17, 2010
2010
Sent from my Palm Pre. Forgive thumbos.
—Jennifer 8. Lee, jenny8lee, March 17, 2010
2009 (earliest)
thumbo. A typographical error made while using thumbs only to text mesage [sic].
—“thumbo,” Urban Dictionary, October 03, 2009
Notes
I didn't notice the "typo" ("thumbo?") in the lower right corner of the first page until i scrolled down to the second page.
—rtdunham, “Google books iPhone-friendly; Amazon Kindle books next?,” AppleInsider, February 07, 2009
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