the remains of a condom that has been forgotten about after a night (or day) of deliciousness.
The "fucker" has woken up to find a condom caked to his wang.
I fucked her last night then passed out and woke up to a condom cake.
A girl that has had more condoms in her than Annabel Chong
"Last Night We All Got Together And Gangbanged That Slut... Totally Made Her Ass A Condom Cake!"