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It is when two men perform sounding with a double ended object (putting a smooth blunt object into the urethra) but also performing docking at the same time (interlocking each others penis with the foreskins.

the end result of a bad minch can be called a blood sausage.
I've been minching so hard with Tom all night, now I have the worst blood sausage.
by alright_dynamite January 01, 2012