The fourth "S". What you do after you shower, shit, and shave.
Bill: "Hey man what took you so long to get here? Kickoff was 10 minutes ago!"
Ray: "Sorry man I barely had time to do the 4 S's and stop at the liquor store before the game started."
Bill: "4 S's? I thought there were only 3."
Ray: "nope, 4. Shower, shit, shave, and schmasturbate."