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!
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!