J-TUBE - a but tube that you use to shove a gerbal in so the gerbal c

a but tube that you use to shove a gerbal in so the gerbal can make your butt feel like it's on fire.

My gerbal was so angry after the J-tube that it turned my butt red.

I used the J-tube like it was a slide for my gerbal.

The J-tube is the worst invention since the wheel... or the toilet.