1 definition by jackinthebox4444

Top Definition
Spontaneous Male Erection For No Apparent Reasons. Extremely common in High School classrooms where cleavage is abundant.

Sleeping in class is also a horrible time for Smefnars, although they are very common.
I was sitting in Math, and when she leaned over a SMEFNAR hit me...
by jackinthebox4444 September 13, 2010

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