Burpin' Burger is a burger joint located in Royal Woods.
It first appears in "Out on a Limo", where Lincoln promised to take his sisters there after his ride in a limo, but abandoned them after experiencing the high life, thanks to Tetherby. At the end of the episode, Lincoln takes his sisters and Kirby there as a way of apologizing to them for the way he treated them earlier.
The restaurant's jingle goes:
Hungry y'all? Look no further!
Come on down to Burpin' Burger!
Grade B beef and special spice!
When it comes back up, it's twice as nice! [belch]