The act of combining wolfbagging & felching, involving a third party for the felching act...the third part is referred to as the "milk retriever"
Guy: I totally hamilton-wason'd my girl last night.
Friend: Excellent! Who was milk retriever?
Guy: It was her sister in law, Emily....
Friend: DAMN...Awesome!
the phrase is used when someone just pulled a dick move. being cash money means being cool and chill, so not being cash money implies the person is being a huge ass, or just fucked up.
yo, did you just throw my beer? that wasn't very cash money of you
hey man that wasn't very cash money of you