To delve deep into the meaning of something
“Mary and I had a long conversation to onion our friendship and we got a lot closer.”
Someone very stupid; Has the IQ level of a vegetable.
Person 1: Did you hear ____ got caught vaping in the school bathroom?
Person 2: At school? Jesus, that guy is an onion
(verb) To wear multiple layers of clothes to look like a 'marshmallow'
Because it was cold outside, she decided to onion.
An onion has layers. It is death. Cut it until you cry. Waaa
Person 1: I'm like an onion...
Person 2: in what way?
Person 1: I'm always cold so I wear many layers, and I make everyone cry.