It's a means, look, or an overwhelming feeling to congratulate someone's good fortune often at the cost of your misfortune. I.e. to congratulate something outwardly while internally thinking FUCK YOU!!!
The runner-up on the gameshow had a look of confuckulations on his face as he shook the winners hand.
After leaving a slot machine that cost her an entire paycheck a new player sat at her machine and hit a massive jackpot after one spin of the reels leaving her clapping and crying in a delirium of confuckulations.