Some poet must have had a lot of fun with these slipping things past the censors. It'd be in the same league as the underhanded C contest - what is the most innocent short text that can be written while slipping in some subtle but likely rather dirty double meaning in.
This was a common thing to do in the late 90s and early 2000s when websites thought you could make 'safe chat' with a limited dictionary and it turns out they were mostly wrong.