Beez in the trap = slave to the wage = gettin my hustle on = making my money
stuck in the money-making trap "I beez in the trap"
NickiMinaj is just a crazy woman spouting off whatever and just really saying she is all that, but the phrase is really about slinging dope.
I too am baffled. I read the lyrics to the Nicki Minaj song and I'm still in the dark, but it doesn't sound like she's a professional bee exterminator, that's for sure.