The act of covering a man's penis in whipped cream and sucking him off until he produces his own cream. When the creams mix, it is then ingested by either one or all participants.
guy 1- "you won't believe what my girl ate last night"
guy 2- "if it was a double cream supreme, then I guess we both did"
guy 1- "...bro..."
A double-cream filling is the cum deposited in a guy's asshole when two dudes fuck him and have cumgasms when they fuck him in his asshole and have cumgasms at the same time.
A Double Decker Cream Pie Is when you have two girls and you cream pie in one of them and then the cum from one pussy drips into the other girls pussy.