When you fold up a bit of Loo Roll and lay it down in the toilet when you have a poo.
This is effective in combating two common issues on the crapper.

1. You don't get any splashback so your bumhole doesn't get wet.

2. When you are in a situation where you don't want other toilet users to know you just had a poo, (usually in a public toilet), you lay one out, and the undesirable plop is silence
Dude, I just forgot to use a safety blanket, the splashback was my own pisswater, and it went into my butthole.
by pansplatterer April 25, 2010
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The blanket you have over your legs that is used to cover yourself if someone walks in while you're beating your dick.
Jim: Dude my mom walked in on me wanking last night
Pete: Oh shit, bro did u get caught
Jim: Nah. luckily I had my safety blanket.
by XxXBennyBooXxX March 28, 2019
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