a nasty, sticky brown substance formed from a mixture of come and poo. Appears during anal sex with someone who needs to take a dump, or has diarrhea. Something covered in coo can be said to be cooey
"Dude! i was hittin'that ass for half an hour before i noticed my dick was covered in coo!"
When someone ejaculates into someones anus then that person defacates, the resulting exrement is a mixture of stool and penile discharge (or-poo and cum)called coo.
me-"Holy fuck bro...I banged this chick up the ass last night then I let her 'coo' on my face.
my buddy-That is sooo fucking sweet dude, I wan't 'coo' on my face too!
Many may think that the word coo is to make birds sounds, but really it stands for something. the something is cranking,one,out = coo. Another version of the word masterbation