helipad
It's the layer of toilet paper you place to cover your shit when the toilet doesn't flush. It's a kind-hearted gesture to save the person who next goes into that cubicle the indignity of seeing your motherload.
Example:
Wesley: Whoa!!! I feel sorry for whoever goes in to that bathroom... The toilet wasn't flushing.
Kirsty: Oh man... Did you at least leave them a helipad?
Wesley: Whoa!!! I feel sorry for whoever goes in to that bathroom... The toilet wasn't flushing.
Kirsty: Oh man... Did you at least leave them a helipad?