Top Definition
IT professional or enthusiast, characterised chiefly by obsessive personality and geeky habits, fastideous approach to work and lack of social life involving anything other than MMORG's or character-based board games
"Hey Chris, stop being such a billett and go home, we are supposed to finish at five o'clock"

"He just sits and plays World of Warcraft all day, we're worried he's turning into a bit of a billett"
by hahabonkbook March 27, 2012
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