What is the meaning of Crack_up?

To laugh.

  1. To laugh heartily.

    To laugh heartily.

    To cause to laugh heartily.

    To tease (someone) or tell jokes at the expense of (someone).

    To break.

    1. To become insane; to suffer a mental breakdown.

      To become insane; to suffer a mental breakdown.

      To break down or fall apart; to stop functioning; to shatter.

      To separate a group.

      To crash an aircraft or automobile.

      To remove the shell from nuts.

      To crack (petroleum). (to break down (a complex molecule), especially with the application of heat: to pyrolyse)

      To affect the image of something.

      1. To praise or applaud (something); to promote a positive view of (something).

        To praise or applaud (something); to promote a positive view of (something).

        To insult, demean or harm the image of (something).

        To cry up; to extol.

        To smoke crack cocaine.

        Funny; hilarious

        Source: wiktionary.org