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."
by MadSunCaribou August 20, 2007
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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.
by Emron April 13, 2022
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