Completely nasty, unbearably so. Such as some of the prank sites on the internet that are really naked old men.
Pedro: Did you see the link Kip sent around?
Napoleon: That was nasty sauce, gosh!
Used in the same way as "sick" or "nasty" or "ill", the descriptive noun "Nasty Sauce" denotes a positive quality by sarcastically using a negative term
"That game is nasty sauce!"