Relating to the popular ROFL ( Rolling on the floor laughing ). ROF stands for "Rolling on the Floor". This occurs when there is a fire and all of sudden you have to "Roll on the Floor" so your ass doesnt get burnt, or when something funny happens and the laughing is self explanitory; therefore one would just "ROF"
Holy shit there's a fire, quick ROF!
Oh my god, that girl has a mean cameltoe, i just ROF'D a little.