Meaning the best in the both known and unknown universe.
This is the betterest pie ever.
by ShiftyJeans November 18, 2013
2 more definitions
the best, its better than better, it's the betterest!!
"my dead baby collection is the betterest"
by Fagdonna May 22, 2004
Better than the best. Cooler than Mount Everest.
Alex is the betterest.
by ronaldspidermonkey February 25, 2012