Someone who is there for you day after day, no matter what, somebody better than a bestfriend, that has never left your side from day they got there, you have the most and best memories with them, fall out over stupid little stuff and are friends again with the hour, take stupid photos, talk about everything, the one you can trust with your life. Makes you smile by thinking about them, never fails too make you laugh or smile and always brightens up your day, bestestfriends is a promise not a label and you prove too eachother its not just for a day its forever!
Your "Bestest Friendest" is someone so close, the title "best friend" just isn't enough. However, you can have a best friend *and* and bestest friendest at the same time-- the bestest friendest would be closest of course, and the best friend would be your second closest friend.