맛있게 드세요! 맛있게 delicious 들다 Eat 들다 + 시 + 어요 = 드세요 ㄹ has a irregular rule Plus honorific marker 시 So, Eat delicious or... Enjoy your meal! More information: Level 3 Lesson 24 / 르 irregular / 르 불규칙 www.talktomeinkorean.com/.../level-3-lesson-24/ Level 5 Lesson 2 / -시- (honorific) / -시-, 하시다 http://www.talktomeinkorean.com/lessons/level-5-lesson-2/

Generally, you can say "Help yourself." "마음껏 드십시오". you also say "Enjoy your meal." It has meaning "delicious" "맛있는/게"