b cock
A tiny weenie so small it looks like it belongs on a mouse. It's like a pebble compared to a normal cock. Some say it's so little it could fit in a raisin.
My buddy got called a b cock because he tried to do a pull-up and it looked like he was trying to lift a marble.
He was so ashamed he tried to hide his cock in a sock and it still didn't fit.
At the beach, he tried to swim and his cock was so small it looked like it was just a little dot in the water.