The sound that it makes when you step on a used condom. (very high-pitched)
"Y'know, your night goes well, and you don't wanna leave your girl right after! You wanna snuggle with her! So you tie the condom and throw it wherever, yeah? The next morning, you're like, "I'm gonna start this beautiful day!" and get out of bed, and suddenly, boogle, you've stepped on the condom."