Smelly Onion is a crying half slice of red onion. He has crossed eyes with tears coming out of them.
- Smelly Onion is similar to, and shares a name with Smelly Onion, a Trashie from Series 3 of the Trash Pack.
- He is the second onion Grossery, after Onion Scum from Series 1.
- He is depicted with white eyes in his static art, while his figure depicts him with yellow eyes.
- He and Cruddy Cream appear on the bottom right corner of the Series 2 large packs.
- His static art portrays him as red, while his figure and catalog art have him as purple.
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