He is sufficiently snug as to evoke an onomatopoeic simile involving an insect with penetrating mouthparts that has a small carpet as his domicile.
That's not onomatopoeia.
Sure it is. The cadence and repeated '-ug' syllable evoke the sensation of hugging.
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Sure it is. The cadence and repeated '-ug' syllable evoke the sensation of hugging.
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If "rug" was the sound that a rug makes, then you'd have onomatopoeia. Or if "snug" was the sound that snugness makes.
ETA: That's a great cartoon!