A dismissal with prejudice is dismissal of a case
on merits after adjudication.The plaintiff is
barred from bringing an action on the same claim.
Dismissal with prejudice is a final judgment and
the case becomes res judicata ("a matter decided")
on the claims that were or could have been brought
in it.
The legalese is explained above, like Divest stated
it's a done deal, OVER, KAPUT,
END OF THE ROAD FOR THAT CASE, DROP IT, ETC .
D_DOG