A banjo bolt is usually a bolt, that is hollowed out, at the upper end where threads are not present, near the head of the bolt, there are holes drilled into the body. Then, where the holes were drilled, there was a fitting made, slightly machined out inside, that would fit up on the bolt(around where the holes were drilled) and have a port off of it to connect to a hose. It would seal off with copper/any compression ring.
These save space and are very common on european cars in general. Here in the states they are more common on diesel fuel systems.
In the case of the 951, on the pipe from the turbo, there is a banjo bolt in the pipe that sends an air signal to the wastegate for opening upon higher boost.
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