As can be gathered from the expression, it indicates a state of intense anger and annoyance, so much so that the person making the threat is ready, willing and able to inflict physical pain and degradation upon the person who has annoyed them. While it may not literally result in the removal of the offenders head and defecating into the stump, it will usually result in physical violence and a humbling of the person who caused the offence.
The expression that is believed to have originated with the British Royal Navy. It gradually became used within all branches of the armed forces and later spread to the civilian organisations associated with them before obtaining wider usage.

"Malcolm if you don't fuck off I'm going to rip your head off and shit down your neck!"

Rip your head off and shit down your neck by AKACroatalin March 19, 2015

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B-Down

Someone or something thats retarded.
This is an alternative word to retarded.

Lydio: did you see that retard over there he’s really retarded
Dalziel: no don't say that thats rude . That guy is B-down.
Lydio : bet

B-Down by Anonymous errors January 23, 2020