Here's some context:
The lift’s taking an eternity. A smidgeon of Mr Staffa’s exceedingly pure cocaine would score 180 right now – my tea-time Red Bull’s worn off – but a glug of Kilmagoon Special Reserve from my cunningly concealed hip-flask will have to suffice.
It's from Earth calling Taylor short story by David Mitchell.
Possibly, it's reference to Scrabble score for word "smidgeon" or something because earlier in this story characters are talking about Scrabble a bit. Since I'm not a scrabble player I'm not really sure.