The foul smell you that leaks out of your ass from eating foods like Onions and Garlic.
Guy 1: (sniff sniff) Dude what's that smell?
Guy 2: Oh sorry bro my mom made garlic bread two days ago and this Onion Butt won't leave.
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A Butt so wrinkly that looks like layers of onions.Marco from AIS has this condition.
Mickael Ghorayeb:Look at marco's sexy onion butt.
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When a woman has such a delicate ass with a shape such as an onion
Damn, she got dat onion butt, shits finna make me cry
Onion Butt is usually a term used for a butt shaped like an onion. It’s also a tag on pornographic websites.
1. Damn! Did you see the size on that butt? It’s shaped like an onion! An Onion Butt!
2. I hooked up with a shawty who claims she’s a mixed Cherokee! She had a whole onion butt on her!
3. Did you see Mellisa visiting the other day? She has a whole bakery back there? That onion butt be looking good!