Tits that are so big they feel like a hammer when rested on your face.

Anatidaephobia is defined as a pervasive, irrational fear that one is being watched by a duck. The anatidaephobic individual fears that no matter where they are or what they are doing, a duck watches.

Anatidaephobia is derived from the Greek word "anatidae", meaning ducks, geese or swans and "phobos" meaning fear.

Very very very very large breasts, that you could fit an enitre hammer inside.
HT for short

When a girls tits are bigger than her ass and give the look of a hammer and or being top heavy.