break friends
Opposite of "make friends". A remarkably civil ceremony that all friendly interaction shall cease, performed with a sharp, single, handshake. You may, at any time, "make friends" again, for instance, if you want to borrow a rubber, with this rhyme; "Make friends, make friends, never never break friends. If you do, you'll catch the 'flu, and that will be the end of you." Warning; this is childish.
written by Ni*k *immo*k, Jo* B*yth, approved by Log

To make friends the forefingers should be linked and shaken, to break friends the little fingers should be used. If you're breaking friends and you really mean it, simple twist your hand during the ceremony and dislocate their finger.
That'll teach them to use your protractor without asking.
written by be*ki mo*s, approved by Susan