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2.
To be an idiot, a loudmouth fool,a social abomination, or a fanny bandit.
1. "look at that man over there mooning the cars on the freeway, he's pulling a pastis"
2. "Why is she stopping her cart in front of the aisle just to get her favorite cake mix"
by The Sam Mitchell August 14, 2008
 
1.
This phrase comes from the comic "Pearls Before Swine".
To fail, to fall on one's face, to turn one's own life into a gross abomination of all that is wonderful.
Stephan is pulling a Pastis!
by Albert Mond August 15, 2008