What is "manically"

Usage examples of "manically".

They laughed manically as the clearish yellow gasoline fell about the zombie, soaking into his clothes and skin.

Lewis, who was spotted from the explosion, did nothing but rock manically on his heels, lips pursed, prepared, like a tiger-cat, to pounce.

Once again, Marley lurched his way manically across the blacktop, eyes bulging, strangling himself as he went.

And while Matthews’s words might have driven someone else to act ruthlessly and efficiently it drove Joshua manically forward toward Matthews, out of control.