large mounded mass of turd that has so amply filled the toilet that a portion of the turd has risen above toilet water level, with the greater part of its bulk under the water, often inducing pride and relief in the deliverer
The act of bidding something you're not going to pay for, typically used on eBay and other online auctions. Shitbids are often a ridiculously high price much, much higher than the value of the actual item being sold. A shitbidder usually targets the person selling the item, often with the intention of making the seller lose money due to a personal grudge.
I posted something on eBay and somebody shitbidded it up to $5000. Now I have to pay to relist it again because he didn't pay.