*stuck on someone or something
1. Lit. attached, as if by glue, to someone or something. (Typically: be ~; become ~; get ~.) The gum is stuck on me. How do I get it off? The gum is stuck on the floor.
2. Fig. in love with someone or something; entranced with someone or something. (*Typically: be ~; become ~; get ~.) Judy is really stuck on Jeff. She is stuck on herself.
stuck on something
1. Fig. to be locked into an idea, cause, or purpose. Mary is really stuck on the idea of going to France this spring. You've proposed a good plan, Jane, but you're stuck on it. We may have to make some changes.
3. Fig. to be confused by something, such as a puzzle or a task. (*Typically: be ~; become ~; get ~.) I'm stuck on this question about the tax rates.