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A phrase used to express lack of understanding when everything should be perfectly clear.

A way of saying "I should understand this completely, but it makes no sense whatsoever."

Origin: In the 1980s ski comedy "Hot Dog: The Movie," the antagonist proposes a Chinese downhill to resolve all conflicts between himself (the hotshot skier) and the protagonist (not so talented skier/cool guy). After they outline what's at stake -the girl, rule over the slopes, cash, etc. -the comic-relief Chinese guy leans in and asks "Wha te fuck is a Chinese downhir?" (A Chinese downhill is a ski race with a shotgun start -first one to the bottom wins.)
Journalists talking about a story that's been assigned, but the second journalist missed the meeting:

J1 -"Good luck getting Pee Wee Herman to discuss his movie theater fetish. You better get on it; deadline is Friday."

J2 -"Pee Wee Herman about what? When did this happen? What the fuck is a Chinese downhill?"
by The Afterworld Cafe June 26, 2007
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A non-retarded unit of measurement used by countries that didn't loose their twin towers.
"Logan, the lap will be 3.69 kilometers long"
"WHAT THE FUCK IS A KILOMETER?"
by Kuk Poo June 13, 2023
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its used for saying i love you or you are my best friend or my wife.
hey bro, WHAT THE FUCK IS A KILOMETER

bro: awwwww you are my WHAT THE FUCK IS A KILOMETER too!

husband: hey vanessa, WHAT THE FUCK IS A KILOMETER!

vanessa: thank you faggot
by spookupt January 2, 2025
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