A 22nd century post sex act performed by grabbing the females ankles, whipping her around your head in a helicopter motion and slinging her as far as humanly possible, to ensure male offspring.
"We really wanted a boy, so we did the Scottish hammer."
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when you get a notification on one device and then another, and another, and another in quick succession - this is what is known as the "echo". Also known as "an echo".
Dude, your notification echo is a real pain in the ass.