1
general::
Phrase(s): and then some
and even more; and more than has been mentioned. • John is going to have to run like a deer and then some to win this race. • The cook put the amount of salt called for into the soup and then some.
McGrawhill's American Idioms And Phrasal Verbs
2
general::
And considerably more, as in I need all the help I can get and then some, or The speaker went on for an hour and then some. This idiom may originally have come from and some, a much older Scottish expression used in the same way. [Early 1900s]
American Heritage Idioms