Hajirai Machine Girl
Yes - your eyes is not being playing twicks on you. This bikini girl does indeed have the nozzle of a machine gun sticking out of her buttocks.
Hajirai Machine Girl is a spinoff movie from the epic Machine Girl and will be in some theaters next Jan.
Trailer below - skip to the middle-ish to see the action. Not for those with a weak stomach.
The epic original Machine Girl below.
Thanks to FatB for this breaking news.