This is the term for a bass drum (usually around 26'' to 28'' in diameter that includes two heads, rims, and a PEDAL kick attatched to the front) used by unversed, somewhat-naive people who dont know any better.
Sophia: So do you play the pedally drum thing too?
Thomas: What are you talking about?
Sophia: You know...on the drum set..
Thomas: Do you mean the BASS drum...
Sophia: I guess?
Thomas: you have SOOO much to learn