1) WWII German 6 shot rocket launcher.
2) A rapid fire male orgasm that shoots streams of loads as it pulses.
1) Heinrich and Otto were excellent in knocking out tanks with their Nebelwerfer.
2) As she gave me felatio on my swollen member, I came in rapid rocket shots similar to a WWII Nebelwerfer.
You see, a nebelwerfer is made mainly of metal.