"Crash on the barrelhead" seems to be a song by Old 97. Gets about 3500 hits on Google. Attempts to limit the search by excluding "Old 97" or "Fight Songs" (the album "Crash …" is on) seem to do nothing to eliminate references to the song but do reduce the hit count somewhat. There may be a hit or two that use the phrase independently but I'm not going to dig for it. I suspect the origin is in a damp squid for Elizabeth's "cash on the barrelhead."