A Slip of the thumb 

is an unintentional mistake made whilst texting, either sending the message to the wrong person or not noticing when predictive texting chooses the wrong word, often to embarrassing or very funny consequences.

a slip of the thumb is or perhaps an email sent by a handheld device. You might not notice when your predictive texting selects the wrong word – book instead of cool for example, or nun instead of mum! I have a Spanish friend 'Viki' V-I-K-I, and when I type in her name it comes out ugli, U-G-L-I. A well-known brand of vodka even comes out as poisoned if you’re not careful.

A Slip of the thumb by Tara.m April 21, 2010