That would be the trio of bli, bla, and blub
Although in test-code and designs that are designed to be thrown away, i usually use $mist, $kraffel, und $dreck from my local austrian dialect for garbage. Just as a reminder for myself that the code should neither be released to the public nor used in production. (function names often follow a similar pattern, but their mentioning in PM would probably get me banned).
"For me, programming in Perl is like my cooking. The result may not always taste nice, but it's quick, painless and it get's food on the table."