Sperm Back-up Problems. The male version of PMS which explains why a man is in a foul mood, secondary to his back up of sperm from not getting off lately.
Greg sure is being a jerk today, he must be suffering from S.B.P., maybe Sally stopped putting out.
it stands for Shit Pub Monday, this is where every monday you go to a different local shit pub. set im in portsmouth university by, steven, Alan, Craig, Martyn and Chaz