its a mechanic peynus that shoots loads upon puttin some effort in it.
it has a good load of black goo to squirt all over a planet or area. supposedly, some android finds a way to play with engineer weener-device and does something messy.
after all, the engineers supposedly are not able to use their ding-dong anymore, or just lack productive ding-dongery capabilities alltogether, so they found a way to still use the didgeridoo but it has to be mechanical. that's where the suit comes in. the mechanical peynus is hard-wired to the pilot by some kinky cables that go into a very tight mechanical suit, that is doing very much stimu-stimu-stimulation.
to make things even more kinky-dinky, the (ab)user gets a mask put on, which has a very suspicious slong connected to it which suggestedly - after all, nobody said it doesnt - houses a tubular object like that of a facehugger, and might feed oxygen (or whatever goes) orally to the creature that decided to take a seat on that centre seat.
in other words, it's just a really really big alien fleshlight...........