Burgerpants is a good card if you want to get some money in your pocket. He gives you 9 gold when placed, which will end you up with a 3G profit. However, it will also give 4G to the enemy at the end of that turn, so be careful.
While it may seem like a huge issue to give your opponent money, you can use Burgerpants in a Bravery Deck in order to have enough money to finish your opponent off.
Keep in mind that if you combine this with Mettaton EX, the enemy will still get their 4 gold from Burgerpants' effect.
Burgerpants himself isn't a good card on his own, with just 2/2, so you can use him as a disposable card. You can for example use him to damage a monster in order to let Asgore finish it off. You can also place Taunt on him with Glad Dummy for some minor extra defence.