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Back-of-the-Mask Thinking 

When the crisp-and-crude method of calculation, which yields an approximate instead of an exact answer to a problem, is done on a mask rather than on an envelope or a napkin.
With billions of people wearing a face mask to shield themselves against the coronavirus, the back-of-the-mask thinking is a lifelong guesstimation skill math teachers and tutors worldwide ought to promote to students during this pandemic crisis.
Back-of-the-Mask Thinking by MathPlus September 20, 2020
Related Words

The Earl's Delightful Tea Mask

When you're wearing a kilt and squat over someone's face, with your balls near their mouth, and then fart.
It's bad enough you tackled him, worse that you did it while wearing a kilt, but did you really need to give him the Earl's Delightful Tea Mask?

Gorilla Mask 

When a guy shaves his pubes and puts them in a bag. Then a girl gives him a blowjob until he is gonna cum. Then he will cum on her face. and empty th bag of pubes on her face. making the pubes stick to her face and looking like she is wearing a gorilla mask.
Jenna: "You know Mark?"

Jessica: "Yeah, I heard he gives massive Gorilla Masks

Jenna: "Its true, He gave me on and i used it on Halloween!"

gorilla mask 

You shave off the person's pubes and put them in a ziplock bag. Then you spunk on their face and then sprinkle the hair over it.
Johnny helped me put together a gorilla mask for my halloween costume.
gorilla mask by Anonymous December 19, 2002

jewish gas mask 

When a man pulls his scrotum over a ladies face and places his butthole directly over the nose. Said man than proceedes to fart mercilessly. The spreading of the ball sack makes a perfect "mask" over the womans face and forces her to deeply inhale any anal flatulence.
Nothing says loving a woman like a good ol' Jewish Gas Mask.

grizzly mask 

When you put glue on someones face, and then dump a bunch of recently shaved pubes on the glue
Oh man, she gave him a sick grizzly mask while he was asleep.
grizzly mask by robopoc December 9, 2008