What is Knifer / Kniver?
1.
A person (usually one of your friends) that says they will do something with you, but then "stabs you in the back" and goes and does something else. (A "cunt kniver" is someone who will do this frequently with their girlfriend).
When someone you made plans with disappears and becomes a Knifer / Kniver
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The captain of the most successful team in Britain, Liverpool F.C. Captained his team in the Champions League Final 2005 against AC Mila..