Klick is a common military term meaning kilometer when referring to distance. Its use became popularamong US soldiers in Vietnam during the 1960s, although veterans of the war recall its usage as early as the 1950s. The term is of unknown origin. It is likely to be an example of condensed pronunciation or contraction of the term kilometer, although other theories exist.
Either a kilometre or a kilometre per hour ("kilometer" for Americans) depending on context. Pronounced as "click" but always written with an initial 'k'.
Common in Canada. In the US it's strongly associated with the military.
See k which can also be used for "kilometre" but not for "kilometre per hour".
"It's about two klicks up the road." (Distance: 2 km)
"We were doing ninety klicks." (Speed: 90 km/hr)
And dying in yo' bed many years from now, would ya be willing ta trade all da days from dis here day ta dat fo' one chance, just one chance, ta come back here as young men an' tell our enemies dat dey may take our lives but dey will never take our freedom ... YUB NUB!