Hi, Hujok. 등업 is a kind of internet slang, a noun, a shorten word of 등급(level)업(up from the english word up). It means 'promotion on an internet group' Examples; 등업 부탁드려요. please elevate me to the higher level. 등업 신청. an application for a higher level. 등업하는 법. How to get into a higher level. If you get into a higher level in a group on the internet(we often call it as 'Cafe'), you can get more advantages such as; you can see more information; you get the right to post something on some specific message boards.

등업하다 등업 is short cut of 등급업 ---> upgrade for ex] im a normal member but i will be change regular member when i was wrote " hi im newby thank you for accepting me" at board.( in internet Cafe) yes, your member grade is changed from normal member to regular member. this is 등업