How the hell do you wear this?

Finally, a pair of pants to cater for my extra arms

I find it intriguing and somewhat disturbing that this has been produced

All i can think of is that they are shorts with fake arms to tie a knot around your waist like when you take off your hoodie?

you don't.

It could be that its just a hoodie but the bottom half isnt zipped and looks like pants

It's for midgets.

SpongeBob?

It's like when people pull their sweatpants up to their upper body and put their arms in their pants
It might be more for comedic effect than for actual wear

Tie the "sleeves" around your waist for that douchey sweater look.

It's for LEGolas