Obscenely large teeth or
dentures that resemble the teeth/dentures of
Gary Busey and Jake
Busey.
Teeth are long and large and often times they look fake because they are so gigantic.
"Buseys" can also be used in general for large teeth/dentures that do not necessarily resemble those of Gary or Jake Busey, but this is a less accurate usage of the word.
Check out the Buseys on that
horse!
Wow, that guy has got some serious Buseys!
That guy can
chomp his way through
iron bars with those
Buseys of his!!