Recently I found an old Nick Jr. bumper that I remembered seeing a long time ago and had wanted to find, which turns out to have been part of the Tricky Trousers series, after I happened to find another which fit the style so I searched the term, and it was pretty much the first I saw in search.
While I remember many of the basics - a voice-over was reciting a poem, it was in clay mation, there were common words that had the "ini" sound, and there was a big man walking in the city - most of it was different from what I remembered. I probably didn't see it too often (it aired during Nick Jr. commercial breaks, and I often had to go to school then).
I was thinking that Muscles Linguini was a giant, that he had a more childlike appearance, that we actually saw him at the start of the short (as opposed to only seeing glimpses of his body until we saw him at the very end - and it would have made sense for him to be more of a giant child considering we don't see his whole body until the end), that the voice-over had a somewhat deeper/slower voices (as opposed to a voice I commonly heard in Nickelodeon promos and bumpers), and I thought one of the lines was "as strong as a weenie" (I'm not surprised that line wasn't actually in it).
It is surprising that the character was also shown/mentioned as smoking a cigar, considering this was aired during the children's block.
I wanted to find more info on Tricky Trousers, but so far can't find any online info anywhere (and have only been able to find one other short). I guess since it just aired during commercial breaks I shouldn't be too surprised (it's not like it was as classic as Inside Out Boy or the Pete and Pete shorts).
On an unrelated note, I heard that the reason Rocko's Modern Life: Static Cling ended up premiering about two years after planned (after we saw a preview of the special), and on Netflix as opposed to Nick, was because the ratings for Hey Arnold: The Jungle Movie were so bad. I think that's a bit ridiculous. While Hey Arnold has a fanbase, I feel Rocko has a bigger fanbase - Static Cling should have aired first.