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...
#boner #cleavage #erection #limp #high school #awkward
by jackinthebox4444 September 13, 2010
Free Daily Email

Type your email address below to get our free Urban Word of the Day every morning!

Emails are sent from daily@urbandictionary.com. We'll never spam you.

×