What is "toejam," as in "toejam football"?

Cecil replies:

The grotty stuff that collects between your toes, of course. A “toejam football” is the disgusting ellipsoid that forms when you rub it with your finger. What Freudian significance it had for the Beatles (cf “Come Together”) I’d just as soon not know.

Cecil Adams

Send questions to Cecil via cecil@straightdope.com.