Almost evil.

666 = evil, hence 665 = almost evil, not quite there yet.
Seen on a t-shirt - front: "665", back: "Almost evil"

As in "That fellow is almost evil, he is 665."
by Lerssi October 31, 2007
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A number used by edgy teenagers to scare the shit out of Christians
bob: hey!
will: hi!
bob: 66...
will: NO DONT DO IT
bob: 665
will: you little shnubernubber. (get it he cant cuss)
by A living bottle of vodka December 09, 2018
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The cops (British 911 hotline)
Hey Siri, cal 665”!
Would you like me to call emergency services?
FUCK NO
by SuperCum November 18, 2019
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