it's basically the already bastardized word "rofl" (Rolling On Floor Laughing) totally slaughtered into Roffles Waffles which means the same thing but doesnt really make sense. Just more fun to say I suppose.
Often used in a tongue-in-cheek way, roffle means to be in hysterics. It comes from the internet acronym ROFL, which stands for rolling on the floorlaughing. Similar to lollers.
"Oh my god, that show was so funny. I roffled for about 10 minutes when he made that joke about the fat guy."
"Ess Tee Eff Yoo"
Playfully and flirtatiously annoy someone to a point when (even though they're angry and aggravated) they hate to love you and can't get enough of you.