Using empty boxes, bags, bottles, etc. to fill with garbage before actually throwing them (and the garbage) away, rather than recycling them and waiting for them to be reincarnated as a box, bag, or bottle made from recycled goods.
Clerk: "Would you like a bag?"
Customer: "Yes please. I don't really need it to carry this stuff, but I'll be precycling it because my bathroom trash can is full and consequently needs a new liner."
Clerk: "How very clever of you. Is that really a word?"
Customer: "Urban Dictionary thinks so, so... yes."
Empty boxes/bags/bottles that are used as trash receptacles before you actually throw them away, rather than waiting on the recycling process to return them to you.
Instead of needlessly buying trash bags, Michael used precycled goods in the form of grocery sacks to furnish his trash can liners.