1. Slang for watching somebody type their password on their keyboard. In much the same way that hackers teach themselves to read upside-down (in order to read documents when seated in front of a desk), hackers can also practice watching people type on the keyboard. Analogy: Crooks often steal credit card numbers in the same way. They stand behind people in line and read their credit cards as they sit on the countertop during handling. From Hacking-Lexicon