hard-on for
To have an out-of-proportion vindictiveness toward someone or out-of-proportion desire to crush someone (metaphorically or literally). The person with the out-of-proportion feeling or the person on the receiving end of the feeling is usually male, but not necessarily so. Generally used with the preposition for.
God, Mark has a real hard-on for Eddie after Eddie got promoted over him.

That bitch, Katy, has a hard-on for Esther because she stole Katy's guy.