trout poutn.colloquial (chiefly British) unnaturally swollen lips resulting from the injection of excessive collagen into the lips in a cosmetic procedure intended to enhance their appearance.
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2002 News of World 15 Dec. 15/2 Surgery to plump up her lips left her with what she describes as ‘my trout pout’.
2014 K. HigginsIn your Dreams x. 190 Lyric had had a little work done... Weirdly inflated lips—the famous trout pout.