Snot.

Last night when I was at a bar meeting people for drinks in honor of a friend's birthday, I went to take a piss and when I got some toilet paper to blow my nose, big hunks of solid green came out. I did the neti pot when I got home, but when I woke up again this morning, I had small yellow chunks, and then after I did the neti pot -- at first no water would come out when I stuck the spout in my nose! -- more opaque whitish pieces came out. I took a benadryl and I can feel more pieces of some indeterminate color lodged way back up behind my left nostril.