SBUing a hoe is much like supermaning a hoe. After having sex with a girl from behind the guy pulls out and cums on the girls back. He then sticks Wolfie's (the Stony Brook mascot) tail on her back. The guy performing the act must also be wearing the Wolfie head at the time. Afterwards he yells SBUUUUUUUU.
Man, I'd SBU dat hoe anyday.