Said after a very corny, very unfunny joke. Derived from the old Vaudeville comedy acts in which almost every one-liner was punctuated by a musical jingle. Usually played on the piano by a portly man with bright red cherub-like cheeks.
to take any opportunity (or create one) to complain about your life in the most annoying way as possible in order to get sympathy and recognition for miniscule accomplishments.
Boy: Hey, can I borrow your math notes?
Girl: Yes, but my great uncle-in-law died today and I'm not sure if I'm going to be ok or not, because I tried to call my friend and tell him about my great uncle-in-law and he wouldn't pick up his phone even though I called him 8 times and left messages and sent him like 20 texts.
Boy: Damn, stop schlacking off, I just needed to study for the quiz.