were itcomes from

[duffy66]

were does the saying cowerdy cowerdy custerd come from

[Quizmonster]

Perhaps because custard is yellow and that is a word often used to mean 'cowardly'. There is also the repetitive 'c'-sound which is always good for chanting. In addition to that, 'Cowardy Cowardy Custard' was the title of a play in the early 19th century, apparently, that being the earliest recorded instance of its use.