Never forget that Kanye West had a guest verse on a Katy Perry song in which he says

Odradek

Pockets on Shrek, rockets on deck 

Tell me what's next? Alien sex

Imipolex G

which, I imagine, is by far the best lyric in any Katy Perry song.

Salix Babylonika

I will now rapgenius this song for you:

his pockets are like Shrek in that they are fat and green

he has shooters (rockets) on deck, the rockets tie in to the space theme

and he is going to fuck you. Or your girl, if you're a man, because you (or your girl) like that freaky shit, which only an "extraterrestrial" like Kanye can provide.

Bee

Imipolex G said:

which, I imagine, is by far the best lyric in any Katy Perry song.