Wubcus Share definition Flag W.B.C.S. (pronunced wub-cus)Waistband Boner Control System.The act of tucking your erection in the waistband of your underware to avoid a potentially embarassing moment. Yo i had to bust out the wubcus when Anastasia was grinding on me. Wubcus by Rev Don January 5, 2008 0 0 Get merch Get the Wubcus mug. Buy Now — $32.95 See more merch