The more I think about it, the more I’m convinced that the „smol mouth of unhappiness“ and the „smorgaspout“ are actually 2 different expressions.
Like the name says, the „smol mouth of unhappiness“ is tiny. Like this:
The „smorgaspout“ on the other side (although „smol“ is part of it’s etymological origin) has more similarities with this emoticon: :[
See, the expressions are related, but not the same.
Good post, OP.