English edit

 
A butterbutt (Setophaga coronata)
 
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Alternative forms edit

Etymology edit

butter +‎ butt

Noun edit

butterbutt (plural butterbutts)

  1. (colloquial) The yellow-rumped warbler (Setophaga coronata), a North American bird species with a conspicuous yellow rump.
  2. (Australia, colloquial) The yellow-rumped thornbill (Acanthiza chrysorrhoa), an Australian bird species with a conspicuous yellow rump.