What is 8dd?
A modification of the '8D' smiley, which by itself is used to portray a manic sort of joy. The addition of mouths, aka 8DD or 8DDD or even 8DDDDDDD, implies a proportional increase in the degree of cheer.
Shopkeeper: You can have this family of kangaroos for free.
Boyfriend: PREPARE FOR SOME INTIMATE CUDDLING
Boyfriend: AND AFTERWARDS WE SHALL BAKE PIZZAS TOGETHER