The nasty blackish-brown goo that can be found inside a pug dog's nosefold. Has the unfortunate tendency to stain anything it comes into contact with.
Ugh! That pug rubbed his face on my jeans and smeared them with pug butter!
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The reproductive juice excreted from a pug, useually rubbed on your arm or pants after petting a pug.
That pug rubbed pug butter on me!
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