Etymology
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pop-up (n.)

from 1906 as a type of baseball hit; from pop (v.) + up (adv.). As an adjective from 1934 (of a children's book, later toasters, etc.).

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Definitions of pop-up

pop-up (n.)
a book (usually for children) that contains one or more pages such that a three-dimensional structure rises up when a page is opened;
Synonyms: pop-up book
pop-up (n.)
a short high fly ball;
Synonyms: pop fly / pop-fly
From wordnet.princeton.edu