pop out verb5 •(slang) To leave a room or building with the expectation of returning soon. •To appear on the screen as a temporary window or menu. •(slang) To give birth.So you think I should just stay home and pop out kids for the next twenty years? •(slang) To have (something) suddenly come out of its normal position, as in a dislocation or subluxation.He popped out his shoulder during the fight. •To be retired after three strikes, including a popout (pop fly) on the third strike. formspopped out · popping out · pops out