To besot is to make someone dazed or foolish. If television tends to besot you, it would be smart not to watch a lot of TV right before a big test at school.
The verb besot is much less common than the related adjective besotted, which means so infatuated with someone that it leaves you dizzy and a little bit silly. Both words have their roots in the Old English sott, "stupid person or fool." A parent may fill a birthday piñata with toys instead of candy if they believe that sugar would just besot all the party guests.