A 30 Second Sam is someone who can't control their urges while in class. They masturbate to random girls in class and doesn't bother to conceal themself. Ususally a 30 Second Sam is someone who is a social out cast and is shunned for constant masturbation. The 30 seconds is how long it takes for him to start masturbating and finish. And they like their own sperm. When the 30 seconds is up, it is common for him wipe it in his hair and smell his finger, with a bright red face.
by Black Suns January 11, 2012
a chronic masturbator that likes to do his business in class. He "cummed" from Macedonia and now resides in forest lake.
by ipromise4ever January 10, 2012