The obligatory release of semen typically from the male body into some sort of containment device such as a napkin or a tissue to be later discarded. Although this is usually a night-time practice to finally get some sleep, running a batch can happen most anytime there is downtime throughout the day. This includes: not getting sex after begging for it anywhere between 5-35 minutes, having no direction in your life and running a batch just because the internet happens to be available, or going home empty handed after a night out clubbing.
Zeke (after a long night out): "Bro you wanna go hit Denny's for a Grand Slam breakfast since we struck out tonight?"

Me: "Naw man, I think I'm gunna go home, run a batch and call it a night."
by one-5 February 24, 2010
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After I saw Jessica Alba in that bikini I wanted to "run a batch" so bad!
by Derek Davila January 27, 2006
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The act of masturbation, usually taking place while at work, while driving, in an airplane bathroom, or some equally inappropriate place. The sudden onset of this need is most often brought about by some form of visual stimulation, such as the close proximity of some serious talent. Running batch nearly always results in the deposition of a large load on one's work desk, steering wheel, airplane bathroom door, or some equally undesirable location, leaving the sweaty participant to ineffectually clean up the mess with whatever happens to be on hand.
Man, I was sitting next to the hottest chick on the plane last night. I couldn't even wait until I got back to my hotel, I had to run batch right there in the airplane toilet!!
by Meathammer December 14, 2013
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