This looks like a sentence from a song. Song lyrics are often can't be 'interpreted' normally, however, probably we can at least understand what the writer wants to say. From the song, this sounds a 'depressing song'
From that song, it can mean anything actually. But I've got a feeling that it means kind like you betray your friends or colleagues (sold out your friend for something..) and the writer said in previous sentence:
I know the feelings away, uh = he knows that (actually he doesn't really want to do it thus the feelings are off/away)
I will sell out my shit some more, ah (so he will lie/ more with 'some shit'.. shit can mean anything from something cool to tease or try to deceive (someone) or just an angry shout..
"sell out verb
Definition of sell out (Entry 2 of 2)
1 : to sell the goods of (a debtor) in order to satisfy creditors
2 : to sell security or commodity holdings of usually to satisfy an uncovered margin
3a : to sell all the available tickets for sold out the concert
b : to sell all of the merchandise was quickly sold out
1 : to dispose of one's goods by sale especially : to sell one's business
2 : to betray one's cause or associates especially for personal gain
3 : to be or achieve a sellout
For the best interpretation of the song lyric, you can consult the songwriter:
Songwriters: Carlton Mays / Marius Listhrop