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This is a confused attempt to combine the word 'safe' with the phrase 'nice one'. Usually blurted out in pressure situations in the company of intimidating individuals.
Intimidating individual- "There you go bruv"

You- "errr... safe one"
by Aliensuns May 28, 2009
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May 3 Word of the Day
Internet persona(s) who happens to follow you and you happen to follow them back and maintain communication with and have a mutual liking for eachother whether it be friendship wise, etc. (Mutuals if more than one mutual)
Monica: Oh yay! I made a new mutual today because we started following & talking to eachother on twitter and we like eachother (so it seems).
by qtheresurrection March 25, 2015
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2
An almalgamation of the phrases 'safe' and 'nice one' this common used phrase has it's roots in Cambridge surburbia, but is found in all areas of the UK
Tali: "I did like a million pieces of work today!"
Tom: "Safe one babes"
by twg1993 April 12, 2011
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