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1.
(n) A person who ditches plans with his friends for unacceptable reasons.
Dave was a total Lamencourt when he wouldn't meet up at the bar because he "had to baby-sit" and "it might snow half an inch."
by andso'syourface December 27, 2010
 
2.
When someone says they will meet u somewhere and then bails do too pending snowstorm that never happens.
Dave pulled a lamencourt when failing to meet his friends.
by wendy w December 26, 2010