Rolling on the Floor Dabbing - when you've done something so amazing that the only natural response is to dab, but the intensity of the dab takes over and causes you to fall to the floor in a fit of dabs.
Evan: Dude, you just nailed 30 three pointers in a row. Great job!
Ryan: *ROFD*
Rolling on floor drunk - when one has reached the point of intoxication at which the ability to remain vertical fails, and suddenly you are horizontal, laughing because you are slightly confused as to why you are touching the floor with more than two points of your body.
Random Oriental Flopsy with Daddy Issues. Female creature typically aged 18-25 who's rich father forks out huge amounts of cash so that he can expunge the guilt of never actually speaking to her. Usually up for it.
So I woke up in a Hampstead mansion after servicing some ROFDI I met at the club and missed my fuckingnephew's christening!