to make a face like you've smelled something bad in response to the presence of a person or something that has been said.
as in:
"I told him to give you a call about the latest deadline so quit smelling onions at me."
or
"I know she doesn't like me, she's always smelling onions when I see her."
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When you smell so bad of BO, you literally smell like onions. You most likely need to take a shower and use deodorant.
Damn dude, you smell like onions! Take a shower!