Like a rainbow, except a brownbow specifically operates within brown, green, and yellow color spectrum. Generally associated with diarrhea color grading.
After eating that curry last night, I would say I'm about 610nm on the brownbow scale...
Man, what did you eat? I see the full brownbow you left behind...
When you stick your arm up someone's butt and pull out and your arm is covered in poop up to your elbow.
"Hey you might want to go clean your brownbow before dinner"
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