Black cock

in my kitchen, I used to have a black granite counter top. There was also a piece of granite to act as a back splash. At the top of the back splash piece of granite, there was a space of about an 1/8th of an inch between the granite and the wall. I decided to seal up the space. Off to Ace Hardware to explore my options. I found a section with many different products and caulk seem to be the best solution. Problem was there was only white and clear caulk. I went to the front of the store and found two Ace workers there; both white men in their 50's from the southern USA wearing red Ace shirts. I told them my dilemma of finding only clear or white caulk. Where upon the first man said "Oh you want black cock. Fred you ever seen black cock?' Fred answers "I never seen no black cock, plenty of white cock and I like working with white cock." First man retorts "Yeah I never had me no black cock but plenty of white cock." At this point my face is turning bright red from attempting not to burst out laughing and I quickly left the store only to hear Fred say "come on back, I will help you with your white cock."