1. What does it mean?
럭키비키 joins lucky with Vicky, the English name associated with IVE's Jang Wonyoung. In meme use it celebrates good fortune or an optimistic interpretation of a small inconvenience: roughly, 'what a lucky turn for me!'
Also written or said as reokkibiki
2. The nuance
It is linked to 원영적 사고 rather than a general Korean word for luck. It can be cheerful self-talk, but should not minimize another person's disappointment or imply a celebrity endorsement.
3. Examples
“품절인 줄 알았는데 마지막 한 개가 남았대. 럭키비키!”
I thought it was sold out, but there's one left. Lucky me!
“약속이 미뤄져서 책 읽을 시간이 생겼네, 럭키비키라고 생각했어.”
The plan was postponed, giving me time to read, so I thought of it as a lucky turn.
Sources
References support the meaning and usage. Example sentences are written for NoCapWiki.