Definition
To commit to something with; to partner with.
Also Said As
How People Actually Use It
An offer from one to another -- usually to a tight bud or homey -- to COMBINE FINANCIAL RESOURCES to buy a larger quantity of blah blah so as to reap the benefit of volume pricing; saving much money or re-uppin' bigger.
"LEO: "I been broke as a joke, man, after rent and all. And, gas a-leanin' on me! STAN: "I feeyabro. Why'on't you GO IN WITH ME on a QP and sum 40z and we'll forget this shit for tonight. LEO: "Thrizzle in a coupla hoes ... and I'm dizzle widat, maNizzle.""
Source: Urban Dictionary