It's Diary of a wimpy kid + Superbad or if you are an Indian cinema fan, then it's the kiddo version of Phir Hera Pheri.
It's completely awesome. Extremely hilarious.
I laughed out loud at one scene, I won't like to mention. You'll find out by yourself. The three characters are as same as Raju, Babu bhaiya and Shyam of Phir Hera Pheri although just in 6th grade. The things they do are as same as them, and the results are no different. You would love this movie!