And you thought dubbing in Anime is bad..

[Roland_Deschain]

First, because i know this will happen eventually, All your base are belong to us.
Second, and not as stupid and overplayed: the best lines with sexual undertones I've heard yet are actually in an american movie. Star Wars something (return of the Jedi, maybe?) had a few pretty funny lines:
Yoda: "Come. Yes, good food. Come. Hee hee hee."
Someone: "Wedge, pull out. You're not doing any good back there!"
Someone Else: "Must've hit pretty close to the mark to get her riled up like that."
There are some better, but those still stand out for me.

[Bluhman]

 Oh god, this is so bad.

[Meiscool-2]

lol

[Darkfox]

Rowan's Shikigami 2 quotes: #3 and #4 could almost pass off as Duke Nukem... scary.

Archem2 2's MM8 quote: "Shhh... I'm huntin wepoids, heheheheh..." Who hired Elmer anyways?

Bluhman: "Last time I got it wrong and... boom... pilgrim" XD sounds kinda like him...

[Djanki]

Oh, god, it soiled my eardrums~desu....