Aussie slang for Red Rooster, a fast food chain similar to KFC (aka Kolonel's Fucking Crap). Generally less popular than KFC due to their use of shitty crumbed chicken in their burgers, and the fact that they build new stores with a single cashier.
The fun stems from the use of the word root in Australia as slang for sex. This provides an endless source of amusement to us when we hear about Americans 'rooting' for their favourite sports team.
A breakfast muffin made with prunes and coffee grounds baked in, for lots and lots of extra fiber and caffeine. Guaranteed to wake you up, give you plenty of extra morning energy - and go through your entire digestive tract like a Vesuvius of wire brushes!
My wife and I had an argument, so she served me a Roto-Router Red-Eye Morning Wakeup Muffin with my breakfast; and, by the time I got to work, I almost had to stick my thumb up in my butthole, to keep from crapping all over myself as I ran to the nearest restroom!