I was figuring you'd replace the cork with a cock in order to get the contents of the keg out, and replace the cock with a cork when you were done and not going to be needing access for a while.
A bit of etymology; 'cock' as slang for a penis comes from the resemblance in form and function to this sense of the word 'cock', i.e. spout/spigot/tap (if I'm correctly remembering what the OED said when I looked it up because I was curious which direction that transfer of meanings had gone). If the cock has a valve, it's a 'stopcock'. No clue how roosters tie into this etymologically.
(no subject)
A bit of etymology; 'cock' as slang for a penis comes from the resemblance in form and function to this sense of the word 'cock', i.e. spout/spigot/tap (if I'm correctly remembering what the OED said when I looked it up because I was curious which direction that transfer of meanings had gone). If the cock has a valve, it's a 'stopcock'. No clue how roosters tie into this etymologically.