grade schooler 

someone still in grade school (k-8th)
someone who is so young they havent even reached highschool yet

ie. 6th 7th or 8th graders

grade schooler by 4434 May 2, 2004

grade schooler 

1. A childish person or situation

2. A n00b or a rook

"Hey, you wanna go to the mall?" - Bling

"Nah, man, that's grade schooler crap," - Chaotix

grade schooler by Blue Drache November 22, 2004