Top Definition
Spontaneous Mouth Birth (SMB)

Drinking/Eating something so fully and completely vile that it will cause pregnant women to immediately vomit the child through the mouth, giving birth orally.

Often times the side effect of drinking a friend's specially crafted "micro-brew style beer" Like a mulberry beer.

Essentially, vomiting horribly...
My wife took a sip of your micro brew and had spontaneous mouth birth . It was THAT BAD!
#violent vomitting #horrible barfing #consistant ralphing #bile #smb
av Decrata 3. september 2013
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