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Hi, i`m Richard, a Veterinarian from the UK. Hopefully I can help today.
It sounds like he may have eaten something which just has not agreed with his digestive system and his stomach has now expelled it. Sometimes clumps of hair can appear like a long slimy cylinder. If he is showing no further signs, it is unlikely to be a serious issue. There are no worms that tend to grow as fat as you are describing, it is more likely some foreign material he has eaten and it is better out than in.