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1.
The thirteenth month of the year, characterized in North America by cold weather and snow.

For other unusual months, see Febtober.
Marge: voiceover: It all started on the thirteenth hour, of the thirteenth day, of the thirteenth month. We were at Sprinfield Elementary to discuss the misprinted calendars the school had purchased.
Homer: shivering, looking at the calendar Oh, lousy Smarch weather.
by Baller-Ass Nigga November 02, 2004
 
2.
The thirtheenth month of the year.
Lousy Smarch weather. "Don't touch Willy." Good advice.
by Chris March 01, 2005