On windy and even breezy days when a slutty woman's pussy lips can be heard flapping in the wind, giving you the impression there is a flag nearby.
Dude, do you see a flag anywhere around here? I can hear one, but I sure as hell can't see it. Oh wait, nevermind, your mom is wearing a miniskirt with no panties again. That is one flag flapping bitch!
The term in its self serves as an oxy moron such as jumbo shrimp or congress in progress. jacking off being a more manly events and elegance being the more femine thing.
This is the opposite of dog water, if you're fapping in the dog water you are absolutely god. It's a way of saying you're cracked, or goated, but on a whole new level. You are essentially fapping on all the scrubs. You especially say "I'm fapping in the dog water" when playing siege. But make sure to use it correctly or else... jk brooo I'm triiiippin.
* fap! fap! fap! fap! fap! fap!fap! fap! fap!fap! fap! fap!*
"Hey, Bleaux Bigelow, what's going on in there? I hear some aggressive fapping sounds coming from under the door."
wherein an individual leaves their Facebook profile logged in and unattended.. leaving it open to have their status update free to be comically or embarrassingly changed by another person.