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The phrase "life hack".
There was one of these labelled as such the other day retweeted by a few people I follow about how you can make "4% of 75" easier by swapping the numbers and doing "75% of 4". Much amaze. So mental maths.
It's just mathematical commutativity you cretins, and that's a trivial fucking example. How much easier is 47% of 23 than 23% of 47 because of this life hack? None. Just learn to do maths properly.
The phrase "life hack". It comes from the geek idea that human social interactions are as ordered and predictable as computer processes. Also, as @fizzy.bleach observes, they're mostly really fucking obvious or really fucking stupid.