when something is so ridonkulous, so that the ridonkulousness of it is multiplied by three, or, in other words, tripled. thus, it is not just ridonkulous, but TRIdonkulous. the "tri" signifies the triple nature of the ridonkulousness.
karl: shit did you see pyramid that kid made out of orangina bottles?
jay: that was ridonkulous.
karl: no man. that was beyond that. that was TRIDONKULOUS.
Someone who is addicted to obtaining money and building wealth. A money addict and fanatic. Breadheads often work more than one full-time job, and some even participate in illicit activities to "obtain the bread".