rock hard

kivikova As tough, hard, or inflexible as a piece of rock.
1998, Jean Carper, Food - Your Miracle Medicine, page 192

One of humankind's oldest maladies, kidney stones are rock-hard

You are not using the frosting as a glue, as in making a gingerbread house, so it is not necessary that it dry rock hard.

He was pale but rock-hard from exercise, and still had a grunt's haircut.

Workout complete – Miles body was rock hard.

Tommy Lee first shivered when he felt the tongue in his ear, but his whole body shuddered when he felt the deputy's rock hard cock press along the length of his ass crack.

He is rock hard as he mounts her.

Mark does not seem to be suffering from any inner conflict, in that he is rock hard and will not budge from this position.