Possible Clues:

• 'Quit ___ joshin'!'
• "___ out!" (umpire's call)
• Attachment to law
• The Beatles' '___ Blues'
• '-- dern tootin'!'
• Saw or law ender
• The Beatles' "__ Blues"
• “So’s __ old man!”
• "So's --- old man!"
• 'Shut Up 'n Play ___ Guitar' (Frank Zappa album)