don't piss on my butter

Similar to "Don't rain on my parade". No one wants piss in their butter (obviously) so it insinuates someone ruining a situation.

After cooking for 3 hours, my friend complained about the napkins so I said "Don't piss on my butter!"

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The houndstooth

Similar to saying a majority of a group.

“The houndstooth of people didn’t understand this conversation”