'Oh really? -- who?!'

• "___ me, that's who!"
• "Oh really? ___ who?"
• Comes out with, casually
• 'Oh yeah? -- who?'
• Declares, in slang
• Speaks informally, informally
• "___ you!" ("Oh, yeah?")
• Utters, in slang

Wikipedia Word definitions in Wikipedia
SEZ may refer to: Special Economic Zone Seychelles International Airport