Moldy Banana 

When you wake up the next day after having sex and still have the condom on your dick.

So, I fucked this girl last night and then I passed out. When I woke up this morning, I had a moldy banana.

Moldy Banana by Freemont04 August 31, 2013

Mouldy Banana

When you accidentally shit yourself whilst wearing a yellow suit.

Oh Dave, now you look like a proper mouldy banana.

Mouldy Banana by UDicks March 21, 2019