The smallest MEASURABLE time unit known today, 1x10^(-24) seconds. Obviously, smaller units of time exist, but proper equipment and methodology for measuring them does not yet exist. Light travels 2.9979x10^(-16) meters in one yoctosecond, not the 3.33km stated above.
Learn to multiply. This isn't even an 'urban' word, so why is it defined here?
A negative progression of the name “Miles”. To become Yoctometer, a person named Miles must do negative/bush league acts. These acts cause them to be demoted to smaller measurement units. Going from Miles to foot to inch to nanometer and finally to Yoctometer. A common nickname for Yoctometer can be Yocto or JV.
Yo Yoctometer, you're a bush leaguer. Why aren't you actively engaging? Get off the chess ypu bot. 300 elo.