ROFL
ROFL has 2 meanings
Rolling over freakin' laughing
While most people understand ROFL to mean "rolling on the floor laughing," it may also stand for "rolling over freakin' laughing." People often use it when they find something hilarious online or in a text.
For example, you might tweet "ROFL" in reaction to a funny story on Twitter. Or, your friend might text you, "ROFL, that is amazing!" to react to a funny meme you shared.
Example
This show is hilarious. I am ROFL right now!
IKR?!?
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ROFL stands for "rolling on the floor laughing," which is meant to say that you think something is so funny that you fell to the ground laughing. It is most often sent in text messages, but may also be used online on social sites or in chatrooms.
ROFL is similar to LMAO (laughing my a** off) in popularity and hyperbole. Both of these acronyms are used as a more expressive version of LOL (laughing out loud).
You will most likely see ROFL as a funny comment online, an image posted on social media, a goofy sound you heard with another person, or a video you received in a text message. And ROFL will probably only be sent by a teenager or young adult, but some older adults do like to use it to sound cool.