Definition of "2x4" []

• Abbreviation of two by four. (noun)

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• "Since sex and sexuality is so intertwined with morality, safety, health — I believe this should lie in the hands of parents — after a 2x4 has been applied to wake them up."
• "Metallica, with solid intensity and satisfyingly thick guitar sounds to support a decent vocal melody. "2x4" has a neat slightly discordant set of main riffs that make for a decent moderately bluesy rocker, and rounding out what would be side one of four is the mega-hit "Until it Sleeps," which happens to also be my favorite of the album by a good margin."
• "Ravelo, also known in gang circles as "2x4" or "Lumberman," is on the FBI's Ten Most Wanted List and is charged with racketeering, money laundering, heroin possession and cocaine and marijuana trafficking."