Manga with a robot with a penis cannon


It's about a boy and a girl, and the only scene I remember is one in which
they are in a fighting robot, facing off against a bad guy in a robot with a
penis cannon. The robot fires a huge shot and an old lady says "quick! After
it fires a huge load it needs time to recharge" and someone else says "sadly
that's true about most men".

Another line in that same scene: the girl and boy are very cramped in the
robot, the boy is rubbing up against the girls back, and she asks "what is
that poking me?" He says something like "it's the growing tree of the puberty
forest". I don't remember the exact line, it was years ago and it made me
laugh.




It may be the [Neo Armstrong Cyclone Jet Armstrong
Cannon](http://gintama.wikia.com/wiki/Neo_Armstrong_Cyclone_Jet_Armstrong_Cannon)
from [Gintama](http://myanimelist.net/anime.php?id=918).

![enter image description here](https://i.stack.imgur.com/IiytA.png)

