We'll see. Personally I think it's grease. I took a plunger to the drain furiously and after I opened the pipe under the sink to let the water drain into a bucket all that was left on the right sink was sludge.8/10 it doesn’t take a snake. It’s either in the ptrap or caught on the lever that pulls the drain plug up/down. Easy peasy.
I poured a little bit of water into the drain on the left side which is the garbage disposal and and it came right out of the pipe I disconnected under the sink so I believe it's past the disposal and closer to the main line.
I bet not find a mother fukking Lego in there.