Pop-by

A small gift (to briefly let someone know you're thinking of them)

I forgot it was Paul's birthday today. I'll send him a pop-by later.
I buying some Christmas pop-bys for my clients.

Pop by

To visit for a short while

I'm busy now, I'll pop by Amy's house later.
Sam popped in just now but left abruptly.

Pop-by

A small gift.

It's Paul's birthday today, I'm sending him a pop-by.
I buying some pop-bys for my clients.