Fuckin eh
1 - To be in total agreement with the previous statement. 
2 - A term usually found hilarious whilst intoxicated.
1- 
Guy 1: Joe's mom is hot
                       Guy 2: Fuckin EH!

2 - 
Drunk chick 1: Fuckin eh
                         Drunk chick 2: HAHAHA Fuckin EH!!!!!