To enter or issue forth with a quick, sudden motion.

I startled at his popping upon me unexpectedly.

1. To dart; to start from place to place suddenly.

To thrust or push suddenly with a quick motion.

He popp'd a paper into his hand.

Did'st thou never pop

Thy head into a tinman's shop?

To pop off, to thrust away; to shift off.

Suddenly; with sudden entrance or appearance.