safety square 

A condom: a square packaged device that provides safety during sex

Guy: I want sex but I don't have condoms
Girl: don't worry I got some safety squares

safety square by BlasterHawk October 18, 2017

Safety square 

A less popular name for the NFPA 704, or fire diamond

Dude, that substance is stangerous, don’t you see that 3 on the safety square?

Safety square by AL_O0 January 15, 2018

Safety-squaring

The act of discarding the first square of toilet paper while in a bathroom. This removes the outside chance that the last patron touched that piece while removing toilet paper for his own use. This becomes especially important when using a public restroom. Also can be referred to as s-squared.

"Hey man, you better practice safety-squaring when you're done in there."

"Of course I s-squared, what do you think I am?"

Safety-squaring by UWbadgers16 February 18, 2009