Top Definition
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 04, 2007

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