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2.
Illicit activities usually involving marijuana or alcohol.
Dude I think Kevin and all them are doing some extra-curricular activities tonight. To bad you have to study. HA!
by SuperSaiyanGoku October 11, 2008
 
1.
Slang that college students use for the act of engaging in sexual relations
Joe bob likes to engage in extracurricular activities to combat stress due to he busy life in college
by Carol the fabulous February 02, 2009