When you fuck a girl in the ass so balls deep, that her shit gets all over your scrotum. You don't notice the wet shit on your sack until you look down. It's quite shocking.
Unlucky Dude: What the quack, Kacie? Your mud is all over my hairy ballsack!
Kacie: It's your own damn fault for penetrating my asshole so gosh darn deep!
Unlucky Dude: Well now I have a Muddy Duckskin...thanks a lot!!!!
Option: You pretend to roll it on, like in those Trojan Ecstasy commercials where the dude with the white gloves pantomimes putting on a condom when there is nothing there. If you are drunk enough, the next morning you might have actually tricked yourself into believing that you wore a condom.
"That chick was a littlesketchy, did you wrap it up?"