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