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pop in (for a visit)
To come somewhere, usually a person's home, for a brief or casual visit. Hey, if you're free this Saturday, why don't you pop in for a visit? I'd love to show you the new truck I bought. If you're ever in town, you and your girlfriend should pop in. I just need to pop in at the office to see Cheryl, but I won't be staying all day.
pop in(to something)
1. Lit. Inf. to come or go into some place, such as a store, shop, etc., for a moment. Let me pop into the bakery for a minute. I have to pop into the drugstore for some shampoo.
2. Fig. to snap into place in something. The little plastic thing popped into its slot, and the model plane was finished. It pops in and holds tight if you do it right.
pop inor pop by
To come to some place for a quick or casual visit: Can you pop by my house for lunch? I just popped in to say hello.