1)when a moment in time has reached a level of uncommon badassness one would say "ohh shit thats chillicious!"
2) when something you consume is tasty and cold.
3) A sexy chill girl whos hotness makes you smack your lips.
4) general slang created by a badass!
"Arthur, that chillicious chica was all over you!"
"Kristian, surfing was chillious today!"