Onion man

A man who smells so vile that the stench can only be described as “smelling of onions”

Friend 1: You know that one guy, name right?
Friend 2: Yeahhh… he smells so bad, it’s like… onions.
Friend 1: He’s like a superhero! Onion man to the rescue!
Friend 2: A superVILLAIN, you mean.

smurf onion

What you define tiny balls group close together that seem to have never been washed in years

Guy 1: yo you heard tyrone
Guy 2: That guy isn't tough, he got a smurf onion!

Ugly onion

Someone who smells and looks like an onion

In a sentence it is used as she/he looks like a ugly onion

Butt Onion

A butt onion is someone that absolutely sucks

Man Jacob’s a Butt Onion

Caramel Onion

Something which seems to be good at first, like a caramel onion at first appearing like as a caramel apple, which then turns out to be bad or disappointing when you engage with it, like when you bite into a caramel onion and find out that it is not, in fact, a caramel apple.

Diablo IV is a caramel onion.

Not sleeping for 34 hours straight is a caramel onion.

Serve the Onion

To place a fruit or vegetable (usually an Onion) in someones asshole. Either for sexual fetish or for the storage of food so it does not go bad.

Linda:Aw man the onion is going to rot :/
Joe:Bend over I will Serve the Onion
Linda:Yes please daddy

onion enema

Something that makes you cry like a baby.

I asked that bitch out and she rejected me, and now I'm sobbing into my beer like I got an onion enema.