down b

To give someone a sweet uppercut (in the style of Mortal Kombat.)

Yo, dawg, Plaks is such an asshole; so I gave him a down b and knocked his monkey ass down!

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Upside-down b

Upside down b - which if you look at it as a lower case, means p, or methamphetamine. This is a common term used in New Zealand, made famous by Bro'Town.
The letter p is likely to be derived from the main ingredient in methamphetamine, pseudoephedrine.

Eh bro'! I can't believe youse got hooked on upside-down b!

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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