To help someone out by
1) filling in,
2) backup their excuse
3) going along with their lie,
cosign for them, corroborate their story
4) provide supporting firepower for
them in a shootout {Hollywood}
When a band plays a song that has already been written by a old band, and changes it slightly to sound better. But thats not always the case.
Metallica bitched about how people were stealing their music on Napster, but then they turn around and steal a whole bunch of songs by other artists to make their crappy Garage INC cd.