Doolios were a band that existed in 2014. They released their debut single '9 lives' in the UK. They were expected to be touring around North Korea in late 2014 but it was cancelled because it didn't fit Kim Jong Un's music taste. They are widely considered to be the greatest music group of all time.
"hey, shall we play some Minecraft?"
"no, I'd rather listen to doolios"
Annoying dickheads use this to mean yes. Used especially to annoy extremely talented badminton players
D:Can you play on monday?
E: hoolios doolios
D: fucking answer the question..y or n