1. A friendly and satisfying understanding of two or more people not liking each other:

“we have an awesome and undeniable sense of mutual dislike. We are both able to function purely because we understand that the feeling is mutual”

2. A situation where two or more people dislike the same thing/person/happening:

“each and every one of them did not enjoy their dinner. They chewed, swallowed, and nodded in silent agreement that the meal was underwhelming at best. Their dislike for it was thick; it was present in the air; and it was entirely mutual.”