Over-Under Achiever 

Someone who achieves the extra unecessary achievements, but does them in a half-ass fashion.

Patrick decided to be an Over-Under Achiever when he went the extra mile to do his extra credit, even though he already had a 103 percent in his english class. This project was done in a very UNorderly fashion. The rough draft write-up ended up having its title 'rough draft' erased and then replaced with 'Final Project'.

Over-Under Achiever by E-bag March 29, 2010

under over acheiver 

its that One person u know who does dick all but has fucking amazing things happen to him/her consistently.

Calvin is a under over acheiver and always high but for sum reason is a pussy magenet with a 70 sum average

under over acheiver by BluntTrama January 11, 2010