Top Definition
Something you say to a person , to which you are speaking. It means your mother has fat thighs and vagina, therefore everything it that vicinity gets squished together. Creating a vagina/thigh area that looks like an onion would if you cut out a small slice from one side.
Good example: Your mother's onion was a nice ride last night.

Bad example: Your mother used her onion to make fajitas last night.
by Thislethorne November 27, 2010
1 more definition
Nobody knows what it means but it's provocative
Stranger- Get the fuck out of my way
You- Why don't you lick your mothers onions
Stranger- What does that even mean?
You- I don't know but it's provocative
by YMO June 29, 2014

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