An insult that is immature or really just what a kid would say. A typical second grade insult is saying "you're gay" to a person.
Guy 1: "I got some cool shoes today!"
Idiot: "Dude, you're gay"
Guy 1: "Wow, you're reverting to a second grade insult?"
Idiot: "Dude, you're gay"
Guy 1: "Wow, you're reverting to a second grade insult?"
by ImmediateAce March 12, 2014
Get the Second Grade Insultmug.