Typically used as a noun and synonym to "horney" or sex drive, Horn Sauce refers to the actual hormone needed to achieve a male (or female) erection. It may also refer to ejaculant itself.
Also commonly used to refer to semen.
Ex1
Woman: Hey baby, Let's have some good ole fashioned missionary sex.
Man: Hun, I would, but I'm all out of horn sauce.
Ex 2
She was just about to reach climax, when I accidentally blew my horn sauce all over her chia pet.
A bowel movment with the consistency of urine.
Also see: Shpissing(verb)
Ex1.
Man#1: I was just about to head over to karaoke night at the Half Baked Tator bar and grill when I shpissed myself in the kitchen. Yep, took a huge shpiss right there on the carpet.
Man#2: damn