The word ruffles is an expression of amazement, wonderment, disgust, all of the above. It comes from the online ROFL, but with an added S to make it roll of the tongue in sticky situations. The alternative, RUFFLE, is also widely accepted.
Dude, look at that bum, RUFFLES!
Damn dude, ruffles.
Alternatively: Did you see how <insert name> got his ass suckerpunched? RUFFLE.