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When a day just gets worse and worse as it goes on (created when Jeffrey opened the door of a cab and hit a China man who seemed to never stop yelling at him but seemed to keep repeating the word "LUMDAY". Jeffrey just sauntered away without paying the cab fare and disappeared into Chinatown in Toronto.
Rikki:WOW Dayna, You got a fierce hair cut!
Dayna: Thanks, These layers are horrid
Rikki:Did you remember your coaching at 12:30?
Dayna: SHIT! what a LUMDAY!!!
Rikki: Totally, Lum.
by JeffreyB April 04, 2011
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The vengeful act of crapping on a lover's chest while they sleep.

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