The only word that contains those letters is "besotted" and is closer to meaning addled or drunk.
ya hey whats uo im the bste in the wpr;d
According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 1 words with the pattern M-BSTE--. That is, eight letter words with 1st letter M and 3rd letter B and 4th letter S and 5th letter T and 6th letter E. In alphabetical order, they are: mobsters