The term flop is used in community card poker games like Texas Hold’em and Omaha, and it refers to the first three face-up cards that are dealt in the middle of the table for everyone to use.
For example, let’s say you raise from the BTN with AJ offsuit and BB calls. The first three community cards are 7dAcAs, which gives you the trips and is the flop in this hand. Many poker strategies are generally divided into pre-flop and post-flop rounds.