sarcasm or sarcastic is again humor but again of a kind. let us be familiar with it. what is sarcastic

sattire : after finding no water he exclaimed "Oh my gosh! a gallon of water. i will gulp it down and sttire myself."

Stumble : He stumbled at the stairs and fell in lap of her bride and every one was laughing.

Mockingly : He said mockingly" After confirmation, we can have a munch every year from our salary increment."

Lolz : we all know it means laugh out loud. which means to go out and laugh.{ courtsey you tube}