To violently rub your hand into somebody's hair whilst shouting "FLAAAANNNAAAGGGE" causing their hair to become very out of place or 'flanned'. Originated in the North East of England.
being falanga is just accepting things, a kind of “it is what it is attitude”, just rolling with life. like that one meme where there’s chaos in the background and then a dude just sat in the middle of it all with a neutral face, vibing alone and chilling.