This can also be used as a troll term
This phrase, term, whatever, came from the great Tom Hiddleston, who is either: truly Loki, Loki’s spirit animal, or the other way around.
Person 1 (with tray of food): "What, probably around ten bucks right?"
Cashier: "Actually it's already been paid for"
Person 1: "What?"
Person 2: "HEHEHEHEH I BOUGHT YOUR LUNCH FOR YOU! LOKI'D!"
Person 1: "Can you believe Joss Whedon's April Fools prank? He never actually intended on telling us what Loki's army consisted of"
Person 2: "I know! He's such a troll! We totally got LOKI'D!"
Cashier: Actually, it's been payed for already
Tom: -pops out from around the corner- EHEHEHEHE! You're such an idiot, I bought your lunch for you! ehehehe you've been loki'd again! LOKI'D!
Josh: ...okay, got me again...
Josh Horowitz: Thanks, yeah it's like the gas in my engine*drinks*
Tom: *laughs* I totally know what you mean. Uh the funny thing about that coffee is....theres no gas in the engine...
Josh:*confused* What-? What are you talking about???
Tom: Theres no caffeine in it~ so it's decaf~ ...took the caffeine OUT. I de-caffed it. decaff-i-na-to~
Josh: yup, you got me.
Tom: your going to be sooo sleepy later :3
It's DECAFF! and you needed caaffeine! XD
Tom: *laughs at Josh* HAHAHAHAHAA HOOHOHOOO~!! It's a prank! :D
Josh: alright, Tom.
Tom: Your going to be soo sleepy!XD ((Josh: Yep))your not going to be able to stay awake!((Josh: Yep)) You'll look like such an ASS!