[stagbeetle]

I wasn't able to find a way to calculate the prevalence of "welfare queen," but off-hand that phrase doesn't come up too often in the mainstream.

[467568985476]

Here's a Google Trends link: https://trends.google.com/trends/explore?date=all&q=welfare%...

[Jill_the_Pill]

Here's ngram -- a measure of use in books: https://books.google.com/ngrams/graph?content=%22welfare+que...

[stagbeetle]

That was going to be my go-to, but I remembered that search popularity != usage.

Though, I am surprised that the term is hovering around 25%.