Originating from the Beatles song "Glass Onion" off their 1968 self-titled, or "white" album, the term was believed to mean a glass-lidded coffin by the followers of the Paul is Dead conspiracy.
The real meaning of the song is that people were over-analyzing the Beatles' lyrics.
A glass onion is something that would have layer after layer peeled away, only to realise that it was transparent all along.
Lookin' through a glass onion.
The Urban Dictionary Mug
One side has the word, one side has the definition. Microwave and dishwasher safe. Lotsa space for your liquids.
Buy the mug