What does "shit on a shingle" even mean?

I& #39;m serious about this one...I promise not to be sarcastic this time. https://abs.twimg.com/emoji/v2/... draggable="false" alt="🙄" title="Face with rolling eyes" aria-label="Emoji: Face with rolling eyes">

Based on how this was described in this thread...

I would rather eat actual shit off a roof shingle than this https://abs.twimg.com/emoji/v2/... draggable="false" alt="🤮" title="Face vomiting" aria-label="Emoji: Face vomiting">

Was that sarcastic??