pop out in WordNet English dictionary

1. bulge outward
   "His eyes popped"
   start  protrude  pop  pop out  bulge  bulge out  bug out  come out 
   
2. appear suddenly
   "Spring popped up everywhere in the valley"
   pop out  burst out 
   
3. come out suddenly or forcefully
   "you stick a bill in the vending machine and the change pops out"
   pop out 
   
4. exit briefly
   "He popped out for a quick coffee break"
   pop out 
   

pop out in English Wiktionary