Who sings the songs with the lyrics 20 dollars in my pocket, this is freaking awesome?

The song you're thinking of is titled Thrift Shop, by Macklemore and Ryan Lewis.

The opening lyrics are:

I'm gonna pop some tags
Only got twenty dollars in my pocket
I-I-I'm huntin'
Lookin' for a come up
This is f****g awesome

The Seattle hip-hop duo managed to get some serious bragging rights, as they had the #1 song in the country with Thrift Shop for six nonconsecutive weeks without being signed to a label!

Of interest, Macklemore and Ryan Lewis recently performed Thrift Shop at the 2013 Billboard Music Awards and then accepted the Top Rap Song award. They also just became the first duo in history to have their first two singles (Thrift Shop and Can't Hold Us) top the Hot 100 chart.