A boner repellent is something so sexually unattractive that it makes your boner go away
"Wow, that's ugly, that girl's a boner repellent
Sneaking is to make a list, and include something that probably shouldn't be there, and is only there due to the creator's bias
"Top 3 Best US States: 1. Texas, 2. California, 3. Nebraska."
"Bro tried to sneak in Nebraska"