Looking on the internet deeply has found these results:

slip-proof is the most popular phrase on the web.

slipproof 125,100 results on the web	slip-proof 1462,000 results on the web More popular!
Some examples and use cases from the internet:	Some examples and use cases from the internet:
It doesn't look like this phrase is very popular! The search could not find any examples on the internet.	The dispatch of the payment slip will serve as proof of payment.

slipproof

125,100 results on the web

slip-proof

1462,000 results on the web

More popular!

It doesn't look like this phrase is very popular! The search could not find any examples on the internet.