An example of hysterically is screaming while uncontrollably jumping up and down.
He started to laugh hysterically.
It took every ounce of her willpower not to flee hysterically or give in to the desire to collapse and sob.
One police officer joined the hysteria, stripping off his uniform and running into a local bank while screaming hysterically.
This updated version of 1996's hit Tickle Me Elmo slaps his belly, falls forward with his butt sticking out, kicks his legs, and stands back up -- all while laughing hysterically.
Perhaps he needed to " save face " in front of my now hysterically laughing fiancee.